title: Sully (film)

text: The film is based on Sully's autobiography "Highest Duty", rights to which were optioned by producers Frank Marshall and Allyn Stewart in 2010. They developed the screenplay with Stewart's partner executive producer Kipp Nelson, hiring screenwriter Todd Komarnicki. From the start, Sullenberger wanted the film to encompass "that sense of our common humanity", noting that the incident had taken place shortly after the 2008 Great Recession. He explains: "People were wondering if everything was about self-interest and greed. They were doubting human nature. Then all these people acted together, selflessly, to get something really important done. In a way, I think it gave everyone a chance to have hope, at a time when we all needed it." Komarnicki said the difficulty was not depicting the landing in the river, but the investigation afterwards: "It wasn't really a challenge of what to do with the event since that is the thing everyone knows about, it was more about how you parse out the information about the man slowly falling apart and becoming a hero in the eyes of the world when internally and with the investigators it was actually seemingly going the other way."


title: Sully (film)

text: By June 2015, it was reported that Tom Hanks was already in talks to play the lead role of Sullenberger. Much of the rest of the cast was announced in August (with Aaron Eckhart, Laura Linney, Holt McCallany, and Jamey Sheridan joining), September (Jerry Ferarra), and October (Max Adler, Sam Huntington, and Wayne Bastrup).


title: Sully (film)

text: Principal photography on the film began on September 28, 2015, in New York City. On October 15, filming started in Atlanta, where a building in downtown Atlanta was transformed into a New York hotel. Most of the film's budget was spent in Los Angeles, where the crash sequence and water evacuation scenes were filmed at Warner Bros. Studios and Universal Studios Hollywood. Filming also took place in North Carolina; Holloman AFB, New Mexico; and Kearny, New Jersey and concluded on November 25, 2015. The film was shot almost entirely with Arri Alexa IMAX cameras. The film was initially going to be framed for IMAX 1.90:1 and protected for 2.39:1, but by the second day of filming, Eastwood said that they were shooting a movie in IMAX and decided to frame for IMAX.


title: Sully (film)

text: However, the film was released in 2.39 in standard theaters and 1.90 in IMAX. The aviation mock-up/props and effects were supplied by Scroggins Aviation Mockup & Effects. They used three retired decommissioned airplanes (Aircraft Mock-up/Props) during the making of the film.


title: Sully (film)

text: "Sully" premiered at the 43rd Annual Telluride Film Festival on September 2, 2016, and was released in the United States in conventional and IMAX theaters on September 9 by Warner Bros. When deciding when to release the film, Warner Bros. executives had begun circling the first weekend after Labor Day, considering that most adult fall dramas do not begin opening until September or October. However, this meant that the release coincided with the 15th anniversary of the September 11 attacks, which made executives wary as the film contains a dream sequence in which the plane crashes into Manhattan skyscrapers. But Warner Bros. domestic distribution chief Jeff Goldstein and his team nevertheless decided to release at that time because ""Sully" is a story of hope and a real hero who did his job." However, according to Komarnicki, the release date was coincidental rather than planned, and he attributed it to box-office logistics, principally the limited availability of IMAX screens during the summer and at Christmas time.


title: Sully (film)

text: "Sully" was released by Warner Home Video on Digital HD on December 6, 2016, with a subsequent Blu-ray, DVD release on December 20, 2016.


title: Sully (film)

text: Despite being shot, almost entirely, with IMAX cameras and released in IMAX theaters in the 1.90:1 aspect ratio, the home media release did not include the film in that aspect ratio, instead including a cropped 2.39:1 aspect ratio that was used for non-IMAX screenings.


title: Sully (film)

text: Several major airlines, including American Airlines and British Airways, did not include the movie in their onboard entertainment, since it could upset viewers. Virgin allowed it, "to celebrate the fantastic skills, training and dedication of airline pilots".


title: Sully (film)

text: "Sully" grossed $125.1 million in the United States and Canada and $115.7 million in other countries for a worldwide total of $240.8 million, against a production budget of $60 million. It broke the September record for biggest global IMAX opening for a 2D film with $5.1 million from 523 IMAX screens, eclipsing the previous record held by "The Maze Runner" ($4.2 million in 2014). In total it had grossed $10 million in IMAX plays globally.


title: Sully (film)

text: In the United States and Canada, "Sully" was released on Friday, September 9, 2016, across 3,525 theaters, of which 375 were in IMAX, and was initially projected to make $25 million on its opening weekend, with Box Office Mojo projecting $31 million due to its large theater count and positioning. Box office trackers were expecting "Sully" to launch in the same range as Hanks's 2013 hostage drama "Captain Phillips", which opened with $25.7 million, and the 2012 airline drama "Flight" at $24.9 million. The weekend after Labor Day has historically been a lackluster period for film revenues, although "Deadline Hollywood" noted that this doesn't apply to the "more intriguing titles". "Sully" was one of four wide releases of that weekend. According to ticket selling website Fandango, it outsold Hanks's previous film, "Bridge of Spies" in advance ticket sales. It earned $1.35 million from Thursday previews at 2,700 theaters, which marked the biggest of Hanks's career, and was considered strong by Box Office Mojo given that it coincided with the first NFL game of the season. On its opening day it made $12.2 million (including Thursday previews), of which $1.3 million came from IMAX. It is the second-biggest Friday ever for a wide Eastwood opening, trailing behind only the $30 million opening day of "American Sniper". In total, it grossed $35 million from its opening weekend, which is one of the top five September openings of all time (or twelfth adjusted for inflation). The debut is the second-biggest wide release opening for an Eastwood movie, behind the $89 million of "American Sniper", and Hanks's third-biggest live-action debut behind "The Da Vinci Code" ($77 million in 2006) and "Angels & Demons" ($46 million in 2009). It also performed exceptionally well in IMAX, having been shot entirely in that format: for the weekend alone, it brought in a record $4 million from 375 auditoriums, being 11% of the total gross. This broke the previous September weekend record held by "The Equalizer" of $3.1 million in 2014.


title: Sully (film)

text: The film continued to dominate the box office, with only a modest decline of 36% to post $21.6 million in its second weekend, despite competition from three new wide releases: "Blair Witch", "Bridget Jones's Baby" and "Snowden". It finally lost the top spot in its third weekend, after the releases of "The Magnificent Seven" and "Storks".


title: Sully (film)

text: Warner Bros. and Village Roadshow were thrilled by these results, as were theater owners, particularly as September tends to see a fall in box offices as schools re-open and new TV shows are marketed. Scott Mendelson of "Forbes" magazine suggested that the film had potential to surpass $100 million, since Tom Hanks's films tend to be "leggy" and post big multiples, and "Sully" is aimed at older audiences who don't usually go to the opening weekend. "Deadline Hollywood" pointed out that the marketing effort had been key to the robust opening (as well as good reviews and positive word of mouth), despite the absence of both Eastwood and Hanks on social media. The film was released on the 15th anniversary of the infamous September 11 attacks, but Warner Bros.' domestic distribution chief Jeff Goldstein said that the anniversary did not post a big – either negative or positive – impact on the film. According to a comScore audience survey, 82% of the moviegoers were older than 25, 80% above 35, and women comprised 56% of the opening weekend. 39% said Hanks was their principal reason for seeing it.


title: Sully (film)

text: The film opened across 39 countries simultaneously with America and grossed an estimated $10.5 million from about 3,600 screens. IMAX comprised $1.1 million of that from 148 IMAX screens. It scored the biggest opening of any Eastwood film in Russia with $1 million (although it was No. 3 for the weekend behind "Ben-Hur" and "Sausage Party)," in the UAE with $1 million, and it was the second biggest in Australia with $2.4 million, where it had the advantage of opening on Father's Day. It was released in Hong Kong during the Mid-Autumn Festival, delivering first place at the box office with $777,000. In Japan, it scored the third biggest opening for Eastwood with $2.3 million, behind "American Sniper" and "Letters from Iwo Jima". "Variety" predicted it would end its run there with around $15 million.


title: Sully (film)

text: In Brazil, after the aircraft disaster involving the football team Chapecoense, Warner Bros ordered the delaying of the release from December 1 to December 15. The film was released in China during a crowded period (December 9), but managed to score an opening weekend worth $5.5 million from about 5,000 screens.


title: Sully (film)

text: Outside North America, the biggest markets have been Japan ($13.2 million), Australia ($9.9 million), the UK ($5.4 million), and Italy ($5.1 million).


title: Sully (film)

text: On Rotten Tomatoes, the film has an approval rating of 85% based on 346 reviews, with an average rating of 7.20/10. The website's critical consensus reads, "As comfortingly workmanlike as its protagonist, "Sully" makes solid use of typically superlative work from its star and director to deliver a quietly stirring tribute to an everyday hero." On Metacritic, the film has a weighted average score of 74 out of 100, based on 46 critics, indicating "generally favorable reviews". Audiences polled by CinemaScore gave the film an average grade of "A" on an A+ to F scale, while those at PostTrak gave it a 90% positive score, with 72% saying they would definitely recommend it. 48% said they went to see the film due to interest on Flight 1549's story, while 40% went because of Hanks.


title: Sully (film)

text: Peter Debruge of "Variety" gave a positive review, praising Hanks and saying, "This is Hanks' show, and he delivers a typically strong performance, quickly allowing us to forget that we're watching an actor. With his snowy white hair and moustache to match, Hanks conveys a man confident in his abilities, yet humble in his actions, which could also be said of Eastwood as a director." IGN reviewer Simon Thompson awarded 9/10, writing: ""Sully" is a beautifully balanced, classily nuanced and hugely engaging film that avoids all the clichéd pitfalls it could have slipped into. Tom Hanks gives one of the best performances of his career and Clint Eastwood's direction is beautiful and rich. It's not just a great movie, "Sully" is one of the best pieces of cinema that a major Hollywood studio has released this year." Manohla Dargis of "The New York Times" praised both the film and Eastwood's direction, saying it is "economical and solid, and generally low-key when it's not freaking you out".


title: Sully (film)

text: Todd McCarthy of "The Hollywood Reporter" called it "[A] vigorous and involving salute to professionalism and being good at your job". Peter Travers of "Rolling Stone" gave 3.5 out of 4 stars and wrote, "the movie earns your attention and respect by digging deep, by finding the fear and self-doubt inside a man who'd never accept being defined as a hero. It's an eye-opener." Richard Roeper of the "Chicago Sun-Times" awarded it 4 out of 4 stars, praising the film as "an absolute triumph" and saying that Hanks "delivers another in a long line of memorable, nomination-worthy performances."


title: Sully (film)

text: In a negative review, John Anderson of "Time" wrote, "Inevitable is how "Sully" feels. That, and a little soggy, given that the storyline is rooted not in the few seconds of Sullenberger's defining act of heroism, but in the way his conscience, and the National Transportation Safety Board, plagued him in its aftermath."


title: Sully (film)

text: The film generated controversy for its depiction of the National Transportation Safety Board as antagonistic. In a promotional video preceding the release, Eastwood claimed that the NTSB had "railroaded" Sullenberger by "trying to paint the picture that he had done the wrong thing." After its release, NTSB investigators objected to their portrayal. Christine Negroni wrote in "The New York Times" that "the film's version of the inquiry veers from the official record in both tone and substance", depicting the investigators as "departing from standard protocol in airline accident inquiries" and instead fictionalizing them as "prosecutorial and closed-minded". NTSB lead investigator Robert Benzon further disputed the film's depiction, saying that investigators "weren't out to embarrass anybody at all", while a former NTSB investigator expressed concern that moviegoers would take it as evidence of "government incompetence".


title: Sully (film)

text: While the film has the NTSB presenting flight simulations showing that the airplane could have been landed at an airport, in the actual public hearing, Investigator-in-Charge Robert Benzon stated that "These flight simulations revealed that a successful return to LaGuardia or a diversion to Teterboro Airport was not assured". After the film was released Benzon said:


title: Sully (film)

text: Hanks told the Associated Press that Sullenberger himself was disturbed by the fictionalized version, going so far as to ask (having reviewed an early draft of the script) that the NTSB investigators' real names be removed from the characters. According to Hanks, Sullenberger felt that the real-life investigators "were not prosecutors" and it was not fair to associate them with changes in the story to depict "more of a prosecutorial process".


title: 3D printing

text: 3D printing or additive manufacturing is the construction of a three-dimensional object from a CAD model or a digital 3D model. It can be done in a variety of processes in which material is deposited, joined or solidified under computer control, with material being added together (such as plastics, liquids or powder grains being fused), typically layer by layer.


title: 3D printing

text: In the 1980s, 3D printing techniques were considered suitable only for the production of functional or aesthetic prototypes, and a more appropriate term for it at the time was rapid prototyping. , the precision, repeatability, and material range of 3D printing have increased to the point that some 3D printing processes are considered viable as an industrial-production technology, whereby the term "additive manufacturing" can be used synonymously with "3D printing". One of the key advantages of 3D printing is the ability to produce very complex shapes or geometries that would be otherwise impossible to construct by hand, including hollow parts or parts with internal truss structures to reduce weight. Fused deposition modeling (FDM), which uses a continuous filament of a thermoplastic material, is the most common 3D printing process in use .


title: 3D printing

text: The umbrella term "additive manufacturing (AM)" gained popularity in the 2000s, inspired by the theme of material being added together (in any of various ways). In contrast, the term "subtractive manufacturing" appeared as a retronym for the large family of machining processes with material "removal" as their common process. The term "3D printing" still referred only to the polymer technologies in most minds, and the term "AM" was more likely to be used in metalworking and end-use part production contexts than among polymer, inkjet, or stereolithography enthusiasts. Inkjet was the least familiar technology even though it was invented in 1950 and poorly understood because of its complex nature. The earliest inkjets were used as recorders and not printers. As late as the 1970s the term recorder was associated with inkjet. Continuous Inkjet later evolved to On-Demand or Drop-On-Demand Inkjet. Inkjets were single nozzle at the start; they may now have as many as thousands of nozzles for printing in each pass over a surface.


title: 3D printing

text: By the early 2010s, the terms "3D printing" and "additive manufacturing" evolved senses in which they were alternate umbrella terms for additive technologies, one being used in popular language by consumer-maker communities and the media, and the other used more formally by industrial end-use part producers, machine manufacturers, and global technical standards organizations. Until recently, the term "3D printing" has been associated with machines low in price or in capability. "3D printing" and "additive manufacturing" reflect that the technologies share the theme of material addition or joining throughout a 3D work envelope under automated control. Peter Zelinski, the editor-in-chief of "Additive Manufacturing" magazine, pointed out in 2017 that the terms are still often synonymous in casual usage, but some manufacturing industry experts are trying to make a distinction whereby additive manufacturing comprises 3D printing plus other technologies or other aspects of a manufacturing process.


title: 3D printing

text: Other terms that have been used as synonyms or hypernyms have included "desktop manufacturing", "rapid manufacturing" (as the logical production-level successor to "rapid prototyping"), and "on-demand manufacturing" (which echoes "on-demand printing" in the 2D sense of "printing"). Such application of the adjectives "rapid" and "on-demand" to the noun "manufacturing" was novel in the 2000s reveals the prevailing mental model of the long industrial era in which almost all production manufacturing involved long lead times for laborious tooling development. Today, the term "subtractive" has not replaced the term "machining", instead complementing it when a term that covers any removal method is needed. Agile tooling is the use of modular means to design tooling that is produced by additive manufacturing or 3D printing methods to enable quick prototyping and responses to tooling and fixture needs. Agile tooling uses a cost-effective and high-quality method to quickly respond to customer and market needs, and it can be used in hydro-forming, stamping, injection molding and other manufacturing processes.


title: 3D printing

text: The general concept of and procedure to be used in 3D-printing was first described by Murray Leinster in his 1945 short story Things Pass By "But this constructor is both efficient and flexible. I feed magnetronic plastics — the stuff they make houses and ships of nowadays — into this moving arm. It makes drawings in the air following drawings it scans with photo-cells. But plastic comes out of the end of the drawing arm and hardens as it comes ... following drawings only"


title: 3D printing

text: It was also described by Raymond F. Jones in his story, "Tools of the Trade," published in the November 1950 issue of Astounding Science Fiction magazine. He referred to it as a "molecular spray" in that story.


title: 3D printing

text: In 1971, Johannes F Gottwald patented the Liquid Metal Recorder, , a continuous Inkjet metal material device to form a removable metal fabrication on a reusable surface for immediate use or salvaged for printing again by remelting. This appears to be the first patent describing 3D printing with rapid prototyping and controlled on-demand manufacturing of patterns.


title: 3D printing

text: The patent states "As used herein the term printing is not intended in a limited sense but includes writing or other symbols, character or pattern formation with an ink. The term ink as used in is intended to include not only dye or pigment-containing materials, but any flowable substance or composition suited for application to the surface for forming symbols, characters, or patterns of intelligence by marking. The preferred ink is of a Hot melt type. The range of commercially available ink compositions which could meet the requirements of the invention are not known at the present time. However, satisfactory printing according to the invention has been achieved with the conductive metal alloy as ink."


title: 3D printing

text: "But in terms of material requirements for such large and continuous displays, if consumed at theretofore known rates, but increased in proportion to increase in size, the high cost would severely limit any widespread enjoyment of a process or apparatus satisfying the foregoing objects."


title: 3D printing

text: "It is therefore an additional object of the invention to minimize use to materials in a process of the indicated class."


title: 3D printing

text: "It is a further object of the invention that materials employed in such a process be salvaged for reuse."


title: 3D printing

text: "According to another aspect of the invention, a combination for writing and the like comprises a carrier for displaying an intelligence pattern and an arrangement for removing the pattern from the carrier."


title: 3D printing

text: In 1974, David E. H. Jones laid out the concept of 3D printing in his regular column "Ariadne" in the journal "New Scientist".


title: 3D printing

text: In April 1980, Hideo Kodama of Nagoya Municipal Industrial Research Institute invented two additive methods for fabricating three-dimensional plastic models with photo-hardening thermoset polymer, where the UV exposure area is controlled by a mask pattern or a scanning fiber transmitter.


title: 3D printing

text: However, there was no reaction to the series of his publications. His device was not highly evaluated in the laboratory and his boss did not show any interest. His research budget was just 60,000 yen or $545 a year. Acquiring the patent rights for the XYZ plotter was abandoned, and the project was terminated.


title: 3D printing

text: A US 4323756 patent, "method of fabricating articles by sequential deposition", granted on 6 April 1982 to Raytheon Technologies Corp describes using hundreds or thousands of "layers" of powdered metal and a laser energy source and represents an early reference to forming "layers" and the fabrication of articles on a substrate.


title: 3D printing

text: On 2 July 1984, American entrepreneur Bill Masters filed a patent for his computer automated manufacturing process and system (US 4665492). This filing is on record at the USPTO as the first 3D printing patent in history; it was the first of three patents belonging to Masters that laid the foundation for the 3D printing systems used today.


title: 3D printing

text: On 16 July 1984, Alain Le Méhauté, Olivier de Witte, and Jean Claude André filed their patent for the stereolithography process. The application of the French inventors was abandoned by the French General Electric Company (now Alcatel-Alsthom) and CILAS (The Laser Consortium). The claimed reason was "for lack of business perspective".


title: 3D printing

text: In 1983, Robert Howard started R.H. Research, later named Howtek, Inc. in Feb 1984 to develop a color inkjet 2D printer, Pixelmaster, commercialized in 1986, using Thermoplastic (hot-melt) plastic ink. A team was put together, 6 members from Exxon Office Systems, Danbury Systems Division, an inkjet printer startup and some members of Howtek, Inc group who became popular figures in the 3D printing industry. One Howtek member, Richard Helinski (patent US5136515A, Method and Means for constructing three-dimensional articles by particle deposition, application 11/07/1989 granted 8/04/1992) formed a New Hampshire company C.A.D-Cast, Inc, name later changed to Visual Impact Corporation (VIC) on 8/22/1991. A prototype of the VIC 3D printer for this company is available with a video presentation showing a 3D model printed with a single nozzle inkjet. Another employee Herbert Menhennett formed a New Hampshire company HM Research in 1991 and introduced the Howtek, Inc, inkjet technology and thermoplastic materials to Royden Sanders of SDI and Bill Masters of Ballistic Particle Manufacturing (BPM) where he worked for a number of years. Both BPM 3D printers and SPI 3D printers use Howtek, Inc style Inkjets and Howtek, Inc style materials. Royden Sanders licensed the Helinksi patent prior to manufacturing the Modelmaker 6 Pro at Sanders prototype, Inc (SPI) in 1993. James K. McMahon who was hired by Howtek, Inc to help develop the inkjet, later worked at Sanders Prototype and now operates Layer Grown Model Technology, a 3D service provider specializing in Howtek single nozzle inkjet and SDI printer support. James K. McMahon worked with Steven Zoltan, 1972 drop-on-demand inkjet inventor, at Exxon and has a patent in 1978 that expanded the understanding of the single nozzle design inkjets (Alpha jets) and help perfect the Howtek, Inc hot-melt inkjets. This Howtek hot-melt thermoplastic technology is popular with metal investment casting, especially in the 3D printing jewelry industry. Sanders (SDI) first Modelmaker 6Pro customer was Hitchner Corporations, Metal Casting Technology, Inc in Milford, NH a mile from the SDI facility in late 1993-1995 casting golf clubs and auto engine parts.


title: 3D printing

text: On 8 August 1984 a patent, US4575330, assigned to UVP, Inc., later assigned to Chuck Hull of 3D Systems Corporation was filed, his own patent for a stereolithography fabrication system, in which individual laminae or layers are added by curing photopolymers with impinging radiation, particle bombardment, chemical reaction or just ultraviolet light lasers. Hull defined the process as a "system for generating three-dimensional objects by creating a cross-sectional pattern of the object to be formed". Hull's contribution was the STL (Stereolithography) file format and the digital slicing and infill strategies common to many processes today. In 1986, Charles "Chuck" Hull was granted a patent for this system, and his company, 3D Systems Corporation was formed and it released the first commercial 3D printer, the SLA-1, later in 1987 or 1988.


title: 3D printing

text: The technology used by most 3D printers to date—especially hobbyist and consumer-oriented models—is fused deposition modeling, a special application of plastic extrusion, developed in 1988 by S. Scott Crump and commercialized by his company Stratasys, which marketed its first FDM machine in 1992.


title: 3D printing

text: AM processes for metal sintering or melting (such as selective laser sintering, direct metal laser sintering, and selective laser melting) usually went by their own individual names in the 1980s and 1990s. At the time, all metalworking was done by processes that are now called non-additive (casting, fabrication, stamping, and machining); although plenty of automation was applied to those technologies (such as by robot welding and CNC), the idea of a tool or head moving through a 3D work envelope transforming a mass of raw material into a desired shape with a toolpath was associated in metalworking only with processes that removed metal (rather than adding it), such as CNC milling, CNC EDM, and many others. But the automated techniques that "added" metal, which would later be called additive manufacturing, were beginning to challenge that assumption. By the mid-1990s, new techniques for material deposition were developed at Stanford and Carnegie Mellon University, including microcasting and sprayed materials. Sacrificial and support materials had also become more common, enabling new object geometries.


title: 3D printing

text: The term "3D printing" originally referred to a powder bed process employing standard and custom inkjet print heads, developed at MIT by Emanuel Sachs in 1993 and commercialized by Soligen Technologies, Extrude Hone Corporation, and Z Corporation.


title: 3D printing

text: The year 1993 also saw the start of an inkjet 3D printer company initially named Sanders Prototype, Inc and later named Solidscape, introducing a high-precision polymer jet fabrication system with soluble support structures, (categorized as a "dot-on-dot" technique).


title: 3D printing

text: The Fused Deposition Modeling (FDM) printing process patents expired in 2009. This opened the door for a new wave of companies, many born from the RepRap community, to start developing commercial FDM 3D printers.


title: 3D printing

text: As the various additive processes matured, it became clear that soon metal removal would no longer be the only metalworking process done through a tool or head moving through a 3D work envelope, transforming a mass of raw material into a desired shape layer by layer. The 2010s were the first decade in which metal end use parts such as engine brackets and large nuts would be grown (either before or instead of machining) in job production rather than obligately being machined from bar stock or plate. It is still the case that casting, fabrication, stamping, and machining are more prevalent than additive manufacturing in metalworking, but AM is now beginning to make significant inroads, and with the advantages of design for additive manufacturing, it is clear to engineers that much more is to come.


title: 3D printing

text: One place that AM is making a significant inroad is in the aviation industry. With nearly 3.8 billion air travelers in 2016, the demand for fuel efficient and easily produced jet engines has never been higher. For large OEMs (original equipment manufacturers) like Pratt and Whitney (PW) and General Electric (GE) this means looking towards AM as a way to reduce cost, reduce the number of nonconforming parts, reduce weight in the engines to increase fuel efficiency and find new, highly complex shapes that would not be feasible with the antiquated manufacturing methods. One example of AM integration with aerospace was in 2016 when Airbus was delivered the first of GE's LEAP engine. This engine has integrated 3D printed fuel nozzles giving them a reduction in parts from 20 to 1, a 25% weight reduction and reduced assembly times. A fuel nozzle is the perfect in road for additive manufacturing in a jet engine since it allows for optimized design of the complex internals and it is a low stress, non-rotating part. Similarly, in 2015, PW delivered their first AM parts in the PurePower PW1500G to Bombardier. Sticking to low stress, non-rotating parts, PW selected the compressor stators and synch ring brackets to roll out this new manufacturing technology for the first time. While AM is still playing a small role in the total number of parts in the jet engine manufacturing process, the return on investment can already be seen by the reduction in parts, the rapid production capabilities and the "optimized design in terms of performance and cost".


title: 3D printing

text: As technology matured, several authors had begun to speculate that 3D printing could aid in sustainable development in the developing world.


title: 3D printing

text: In 2012, Filabot developed a system for closing the loop with plastic and allows for any FDM or FFF 3D printer to be able to print with a wider range of plastics.


title: 3D printing

text: In 2014, Benjamin S. Cook and Manos M. Tentzeris demonstrate the first multi-material, vertically integrated printed electronics additive manufacturing platform (VIPRE) which enabled 3D printing of functional electronics operating up to 40 GHz.


title: 3D printing

text: As the price of printers started to drop people interested in this technology had more access and freedom to make what they wanted. As of 2014 the price for commercial printers was still high with the cost being over $2,000.


title: 3D printing

text: The term "3D printing" originally referred to a process that deposits a binder material onto a powder bed with inkjet printer heads layer by layer. More recently, the popular vernacular has started using the term to encompass a wider variety of additive-manufacturing techniques such as electron-beam additive manufacturing and selective laser melting. The United States and global technical standards use the official term "additive manufacturing" for this broader sense.


title: 3D printing

text: The most-commonly used 3D printing process (46% ) is a material extrusion technique called fused deposition modeling, or FDM. While FDM technology was invented after the other two most popular technologies, stereolithography (SLA) and selective laser sintering (SLS), FDM is typically the most inexpensive of the three by a large margin, which lends to the popularity of the process.


title: 3D printing

text: As of 2020, 3D printers have reached the level of quality and price that allows most people to enter the world of 3D printing. In 2020 decent quality printers can be found for less than US$200 for entry level machines. These more affordable printers are usually fused deposition modeling (FDM) printers. In November 2021 a British patient named Steve Verze received the world's first fully 3D-printed prosthetic eye from the Moorfields Eye Hospital in London.


title: 3D printing

text: 3D printable models may be created with a computer-aided design (CAD) package, via a 3D scanner, or by a plain digital camera and photogrammetry software. 3D printed models created with CAD result in relatively fewer errors than other methods. Errors in 3D printable models can be identified and corrected before printing. The manual modeling process of preparing geometric data for 3D computer graphics is similar to plastic arts such as sculpting. 3D scanning is a process of collecting digital data on the shape and appearance of a real object, creating a digital model based on it.


title: 3D printing

text: CAD models can be saved in the stereolithography file format (STL), a de facto CAD file format for additive manufacturing that stores data based on triangulations of the surface of CAD models. STL is not tailored for additive manufacturing because it generates large file sizes of topology optimized parts and lattice structures due to the large number of surfaces involved. A newer CAD file format, the Additive Manufacturing File format (AMF) was introduced in 2011 to solve this problem. It stores information using curved triangulations.


title: 3D printing

text: Before printing a 3D model from an STL file, it must first be examined for errors. Most CAD applications produce errors in output STL files, of the following types:


title: 3D printing

text: A step in the STL generation known as "repair" fixes such problems in the original model. Generally STLs that have been produced from a model obtained through 3D scanning often have more of these errors as 3D scanning is often achieved by point to point acquisition/mapping. 3D reconstruction often includes errors.


title: 3D printing

text: Once completed, the STL file needs to be processed by a piece of software called a "slicer", which converts the model into a series of thin layers and produces a G-code file containing instructions tailored to a specific type of 3D printer (FDM printers). This G-code file can then be printed with 3D printing client software (which loads the G-code, and uses it to instruct the 3D printer during the 3D printing process).


title: 3D printing

text: Printer resolution describes layer thickness and X–Y resolution in dots per inch (dpi) or micrometers (μm). Typical layer thickness is around , although some machines can print layers as thin as . X–Y resolution is comparable to that of laser printers. The particles (3D dots) are around in diameter. For that printer resolution, specifying a mesh resolution of and a chord length generates an optimal STL output file for a given model input file. Specifying higher resolution results in larger files without increase in print quality.


title: 3D printing

text: Construction of a model with contemporary methods can take anywhere from several hours to several days, depending on the method used and the size and complexity of the model. Additive systems can typically reduce this time to a few hours, although it varies widely depending on the type of machine used and the size and number of models being produced simultaneously.


title: 3D printing

text: Though the printer-produced resolution is sufficient for many applications, greater accuracy can be achieved by printing a slightly oversized version of the desired object in standard resolution and then removing material using a higher-resolution subtractive process.


title: 3D printing

text: The layered structure of all additive manufacturing processes leads inevitably to a stair-stepping effect on part surfaces which are curved or tilted in respect to the building platform. The effects strongly depend on the orientation of a part surface inside the building process.


title: 3D printing

text: Some printable polymers such as ABS, allow the surface finish to be smoothed and improved using chemical vapor processes based on acetone or similar solvents.


title: 3D printing

text: Some additive manufacturing techniques are capable of using multiple materials in the course of constructing parts. These techniques are able to print in multiple colors and color combinations simultaneously, and would not necessarily require painting.


title: 3D printing

text: Some printing techniques require internal supports to be built for overhanging features during construction. These supports must be mechanically removed or dissolved upon completion of the print.


title: 3D printing

text: All of the commercialized metal 3D printers involve cutting the metal component off the metal substrate after deposition. A new process for the GMAW 3D printing allows for substrate surface modifications to remove aluminum or steel.


title: 3D printing

text: Traditionally, 3D printing focused on polymers for printing, due to the ease of manufacturing of manufacturing and handling polymeric materials. However, the method has rapidly evolved to not only print various polymers but also metals and ceramics, making 3D printing a versatile option for manufacturing. Layer-by-layer fabrication of three-dimensional physical models is a modern concept that "stems from the ever-growing CAD industry, more specifically the solid modeling side of CAD. Before solid modeling was introduced in the late 1980s, three-dimensional models were created with wire frames and surfaces." but in all cases the layers of materials are controlled by the printer and the material properties. The three-dimensional material layer is controlled by deposition rate as set by the printer operator and stored in a computer file. The earliest printed patented material was a Hot melt type ink for printing patterns using a heated metal alloy. See 1970s history above.


title: 3D printing

text: Charles Hull filed the first patent on August 8, 1984, to use a UV-cured acrylic resin using a UV masked light source at UVP Corp to build a simple model. The SLA-1 was the first SL product announced by 3D Systems at Autofact Exposition, Detroit, November 1978 in Detroit. The SLA-1 Beta shipped in Jan 1988 to Baxter Healthcare, Pratt and Whitney, General Motors and AMP. The first production SLA-1 shipped to Precision Castparts in April 1988. The UV resin material changed over quickly to an epoxy-based material resin. In both cases, SLA-1 models needed UV oven curing after being rinsed in a solvent cleaner to remove uncured boundary resin. A Post Cure Apparatus (PCA) was sold with all systems. The early resin printers required a blade to move fresh resin over the model on each layer. The layer thickness was 0.006 inches and the HeCd Laser model of the SLA-1 was 12 watts and swept across the surface at 30 in per second. UVP was acquired by 3D Systems in Jan 1990.


title: 3D printing

text: A review in the history shows a number of materials (resins, plastic powder, plastic filament and hot-melt plastic ink) were used in the 1980s for patents in the rapid prototyping field. Masked lamp UV-cured resin was also introduced by Cubital's Itzchak Pomerantz in the Soldier 5600, Carl Deckard's (DTM) laser sintered thermoplastic powders, and adhesive-laser cut paper (LOM) stacked to form objects by Michael Feygin before 3D Systems made its first announcement. Scott Crump was also working with extruded "melted" plastic filament modeling (FDM) and Drop deposition had been patented by William E Masters a week after Charles Hull's patent in 1984, but he had to discover Thermoplastic Inkjets introduced by Visual Impact Corporation 3D printer in 1992 using inkjets from Howtek, Inc., before he formed BPM to bring out his own 3D printer product in 1994.


title: 3D printing

text: Efforts to achieve multi-material 3D printing range from enhanced FDM-like processes like VoxelJet, to novel voxel-based printing technologies like layered assembly.


title: 3D printing

text: A drawback of many existing 3D printing technologies is that they only allow one material to be printed at a time, limiting many potential applications which require the integration of different materials in the same object. Multi-material 3D printing solves this problem by allowing objects of complex and heterogeneous arrangements of materials to be manufactured using a single printer. Here, a material must be specified for each voxel (or 3D printing pixel element) inside the final object volume.


title: 3D printing

text: The process can be fraught with complications, however, due to the isolated and monolithic algorithms. Some commercial devices have sought to solve these issues, such as building a Spec2Fab translator, but the progress is still very limited. Nonetheless, in the medical industry, a concept of 3D printed pills and vaccines has been presented.


title: 3D printing

text: With this new concept, multiple medications can be combined, which will decrease many risks. With more and more applications of multi-material 3D printing, the costs of daily life and high technology development will become inevitably lower.


title: 3D printing

text: Metallographic materials of 3D printing is also being researched. By classifying each material, CIMP-3D can systematically perform 3D printing with multiple materials.


title: 3D printing

text: Using 3D printing and multi-material structures in additive manufacturing has allowed for the design and creation of what is called 4D printing. 4D printing is an additive manufacturing process in which the printed object changes shape with time, temperature, or some other type of stimulation. 4D printing allows for the creation of dynamic structures with adjustable shapes, properties or functionality. The smart/stimulus responsive materials that are created using 4D printing can be activated to create calculated responses such as self-assembly, self-repair, multi-functionality, reconfiguration and shape shifting. This allows for customized printing of shape changing and shape-memory materials.


title: 3D printing

text: 4D printing has the potential to find new applications and uses for materials (plastics, composites, metals, etc.) and will create new alloys and composites that were not viable before. The versatility of this technology and materials can lead to advances in multiple fields of industry, including space, commercial and the medical field. The repeatability, precision, and material range for 4D printing must increase to allow the process to become more practical throughout these industries.


title: 3D printing

text: To become a viable industrial production option, there are a couple of challenges that 4D printing must overcome. The challenges of 4D printing include the fact that the microstructures of these printed smart materials must be close to or better than the parts obtained through traditional machining processes. New and customizable materials need to be developed that have the ability to consistently respond to varying external stimuli and change to their desired shape. There is also a need to design new software for the various technique types of 4D printing. The 4D printing software will need to take into consideration the base smart material, printing technique, and structural and geometric requirements of the design.


title: 3D printing

text: There are many different branded additive manufacturing processes, that can be grouped into seven categories:


title: 3D printing

text: The main differences between processes are in the way layers are deposited to create parts and in the materials that are used. Each method has its own advantages and drawbacks, which is why some companies offer a choice of powder and polymer for the material used to build the object. Others sometimes use standard, off-the-shelf business paper as the build material to produce a durable prototype. The main considerations in choosing a machine are generally speed, costs of the 3D printer, of the printed prototype, choice and cost of the materials, and color capabilities. Printers that work directly with metals are generally expensive. However less expensive printers can be used to make a mold, which is then used to make metal parts.


title: 3D printing

text: ISO/ASTM52900-15 defines seven categories of additive manufacturing (AM) processes within its meaning: binder jetting, directed energy deposition, material extrusion, material jetting, powder bed fusion, sheet lamination, and vat photopolymerization.


title: 3D printing

text: The first process where three-dimensional material is deposited to form an object was done with material jetting or as it was originally called particle deposition. Particle deposition by inkjet first started with continuous inkjet technology (CIT) (1950s) and later with drop-on-demand inkjet technology (1970s) using hot-melt inks. Wax inks were the first three-dimensional materials jetted and later low temperature alloy metal was jetted with CIT. Wax and thermoplastic hot-melts were jetted next by DOD. Objects were very small and started with text characters and numerals for signage. An object must have form and can be handled. Wax characters tumbled off paper documents and inspired a liquid metal recorder patent to make metal characters for signage in 1971. Thermoplastic color inks (CMYK) printed with layers of each color to form the first digitally formed layered objects in 1984. The idea of investment casting with Solid-Ink jetted images or patterns in 1984 led to the first patent to form articles from particle deposition in 1989, issued in 1992.


title: 3D printing

text: Some methods melt or soften the material to produce the layers. In fused filament fabrication, also known as fused deposition modeling (FDM), the model or part is produced by extruding small beads or streams of material which harden immediately to form layers. A filament of thermoplastic, metal wire, or other material is fed into an extrusion nozzle head (3D printer extruder), which heats the material and turns the flow on and off. FDM is somewhat restricted in the variation of shapes that may be fabricated. Another technique fuses parts of the layer and then moves upward in the working area, adding another layer of granules and repeating the process until the piece has built up. This process uses the unfused media to support overhangs and thin walls in the part being produced, which reduces the need for temporary auxiliary supports for the piece. Recently, FFF/FDM has expanded to 3-D print directly from pellets to avoid the conversion to filament. This process is called fused particle fabrication (FPF) (or fused granular fabrication (FGF) and has the potential to use more recycled materials.


title: 3D printing

text: Powder Bed Fusion techniques, or PBF, include several processes such as DMLS, SLS, SLM, MJF and EBM. Powder Bed Fusion processes can be used with an array of materials and their flexibility allows for geometrically complex structures, making it a go to choice for many 3D printing projects. These techniques include selective laser sintering, with both metals and polymers, and direct metal laser sintering. Selective laser melting does not use sintering for the fusion of powder granules but will completely melt the powder using a high-energy laser to create fully dense materials in a layer-wise method that has mechanical properties similar to those of conventional manufactured metals. Electron beam melting is a similar type of additive manufacturing technology for metal parts (e.g. titanium alloys). EBM manufactures parts by melting metal powder layer by layer with an electron beam in a high vacuum. Another method consists of an inkjet 3D printing system, which creates the model one layer at a time by spreading a layer of powder (plaster, or resins) and printing a binder in the cross-section of the part using an inkjet-like process. With laminated object manufacturing, thin layers are cut to shape and joined. In addition to the previously mentioned methods, HP has developed the Multi Jet Fusion (MJF) which is a powder base technique, though no lasers are involved. An inkjet array applies fusing and detailing agents which are then combined by heating to create a solid layer. Other methods cure liquid materials using different sophisticated technologies, such as stereolithography. Photopolymerization is primarily used in stereolithography to produce a solid part from a liquid. Inkjet printer systems like the "Objet PolyJet" system spray photopolymer materials onto a build tray in ultra-thin layers (between 16 and 30 μm) until the part is completed. Each photopolymer layer is cured with UV light after it is jetted, producing fully cured models that can be handled and used immediately, without post-curing. Ultra-small features can be made with the 3D micro-fabrication technique used in multiphoton photopolymerisation. Due to the nonlinear nature of photo excitation, the gel is cured to a solid only in the places where the laser was focused while the remaining gel is then washed away. Feature sizes of under 100 nm are easily produced, as well as complex structures with moving and interlocked parts. Yet another approach uses a synthetic resin that is solidified using LEDs.


title: 3D printing

text: In Mask-image-projection-based stereolithography, a 3D digital model is sliced by a set of horizontal planes. Each slice is converted into a two-dimensional mask image. The mask image is then projected onto a photocurable liquid resin surface and light is projected onto the resin to cure it in the shape of the layer. Continuous liquid interface production begins with a pool of liquid photopolymer resin. Part of the pool bottom is transparent to ultraviolet light (the "window"), which causes the resin to solidify. The object rises slowly enough to allow resin to flow under and maintain contact with the bottom of the object. In powder-fed directed-energy deposition, a high-power laser is used to melt metal powder supplied to the focus of the laser beam. The powder fed directed energy process is similar to Selective Laser Sintering, but the metal powder is applied only where material is being added to the part at that moment.


title: 3D printing

text: , additive manufacturing systems were on the market that ranged from $99 to $500,000 in price and were employed in industries including aerospace, architecture, automotive, defense, and medical replacements, among many others. For example, General Electric uses high-end 3D printers to build parts for turbines. Many of these systems are used for rapid prototyping, before mass production methods are employed. Higher education has proven to be a major buyer of desktop and professional 3D printers which industry experts generally view as a positive indicator. Libraries around the world have also become locations to house smaller 3D printers for educational and community access. Several projects and companies are making efforts to develop affordable 3D printers for home desktop use. Much of this work has been driven by and targeted at DIY/maker/enthusiast/early adopter communities, with additional ties to the academic and hacker communities.


title: 3D printing

text: Computed axial lithography is a method for 3D printing based on computerised tomography scans to create prints in photo-curable resin. It was developed by a collaboration between the University of California, Berkeley with Lawrence Livermore National Laboratory. Unlike other methods of 3D printing it does not build models through depositing layers of material like fused deposition modelling and stereolithography, instead it creates objects using a series of 2D images projected onto a cylinder of resin. It is notable for its ability to build an object much more quickly than other methods using resins and the ability to embed objects within the prints.


title: 3D printing

text: Liquid additive manufacturing (LAM) is a 3D printing technique which deposits a liquid or high viscose material (e.g. liquid silicone rubber) onto a build surface to create an object which then is vulcanised using heat to harden the object. The process was originally created by Adrian Bowyer and was then built upon by German RepRap.


title: 3D printing

text: A technique called programmable tooling uses 3D printing to create a temporary mold, which is then filled via a conventional injection molding process and then immediately dissolved.


title: 3D printing

text: 3D printing or additive manufacturing has been used in manufacturing, medical, industry and sociocultural sectors (e.g. Cultural Heritage) to create successful commercial technology. More recently, 3D printing has also been used in the humanitarian and development sector to produce a range of medical items, prosthetics, spares and repairs. The earliest application of additive manufacturing was on the toolroom end of the manufacturing spectrum. For example, rapid prototyping was one of the earliest additive variants, and its mission was to reduce the lead time and cost of developing prototypes of new parts and devices, which was earlier only done with subtractive toolroom methods such as CNC milling, turning, and precision grinding. In the 2010s, additive manufacturing entered production to a much greater extent.


title: 3D printing

text: Additive manufacturing of food is being developed by squeezing out food, layer by layer, into three-dimensional objects. A large variety of foods are appropriate candidates, such as chocolate and candy, and flat foods such as crackers, pasta, and pizza. NASA is looking into the technology in order to create 3D printed food to limit food waste and to make food that is designed to fit an astronaut's dietary needs. In 2018, Italian bioengineer Giuseppe Scionti developed a technology allowing the production of fibrous plant-based meat analogues using a custom 3D bioprinter, mimicking meat texture and nutritional values.


title: 3D printing

text: 3D printing has entered the world of clothing, with fashion designers experimenting with 3D-printed bikinis, shoes, and dresses. In commercial production Nike is using 3D printing to prototype and manufacture the 2012 Vapor Laser Talon football shoe for players of American football, and New Balance is 3D manufacturing custom-fit shoes for athletes. 3D printing has come to the point where companies are printing consumer grade eyewear with on-demand custom fit and styling (although they cannot print the lenses). On-demand customization of glasses is possible with rapid prototyping.


title: 3D printing

text: Vanessa Friedman, fashion director and chief fashion critic at "The New York Times", says 3D printing will have a significant value for fashion companies down the road, especially if it transforms into a print-it-yourself tool for shoppers. "There's real sense that this is not going to happen anytime soon," she says, "but it will happen, and it will create dramatic change in how we think both about intellectual property and how things are in the supply chain". She adds: "Certainly some of the fabrications that brands can use will be dramatically changed by technology."


title: 3D printing

text: In cars, trucks, and aircraft, Additive Manufacturing is beginning to transform both (1) unibody and fuselage design and production and (2) powertrain design and production. For example:


title: 3D printing

text: AM's impact on firearms involves two dimensions: new manufacturing methods for established companies, and new possibilities for the making of do-it-yourself firearms. In 2012, the US-based group Defense Distributed disclosed plans to design a working plastic 3D printed firearm "that could be downloaded and reproduced by anybody with a 3D printer." After Defense Distributed released their plans, questions were raised regarding the effects that 3D printing and widespread consumer-level CNC machining may have on gun control effectiveness. Moreover, armour design strategies can be enhanced by taking inspiration from nature and prototyping those designs easily possible using additive manufacturing.


title: 3D printing

text: Surgical uses of 3D printing-centric therapies have a history beginning in the mid-1990s with anatomical modeling for bony reconstructive surgery planning. Patient-matched implants were a natural extension of this work, leading to truly personalized implants that fit one unique individual. Virtual planning of surgery and guidance using 3D printed, personalized instruments have been applied to many areas of surgery including total joint replacement and craniomaxillofacial reconstruction with great success. One example of this is the bioresorbable trachial splint to treat newborns with tracheobronchomalacia developed at the University of Michigan. The use of additive manufacturing for serialized production of orthopedic implants (metals) is also increasing due to the ability to efficiently create porous surface structures that facilitate osseointegration. The hearing aid and dental industries are expected to be the biggest area of future development using the custom 3D printing technology.


title: 3D printing

text: In March 2014, surgeons in Swansea used 3D printed parts to rebuild the face of a motorcyclist who had been seriously injured in a road accident. In May 2018, 3D printing has been used for the kidney transplant to save a three-year-old boy. , 3D bio-printing technology has been studied by biotechnology firms and academia for possible use in tissue engineering applications in which organs and body parts are built using inkjet printing techniques. In this process, layers of living cells are deposited onto a gel medium or sugar matrix and slowly built up to form three-dimensional structures including vascular systems. Recently, a heart-on-chip has been created which matches properties of cells.


title: 3D printing

text: Thermal degradation during 3D printing of resorbable polymers, same as in surgical sutures, has been studied, and parameters can be adjusted to minimize the degradation during processing. Soft pliable scaffold structures for cell cultures can be printed.


title: 3D printing

text: In 3D printing, computer-simulated microstructures are commonly used to fabricate objects with spatially varying properties. This is achieved by dividing the volume of the desired object into smaller subcells using computer aided simulation tools and then filling these cells with appropriate microstructures during fabrication. Several different candidate structures with similar behaviours are checked against each other and the object is fabricated when an optimal set of structures are found. Advanced topology optimization methods are used to ensure the compatibility of structures in adjacent cells. This flexible approach to 3D fabrication is widely used across various disciplines from biomedical sciences where they are used to create complex bone structures and human tissue to robotics where they are used in the creation of soft robots with movable parts. 3D printing also finds its uses more and more in design and fabrication of laboratory apparatuses.


title: 3D printing

text: 3D printing has also been employed by researchers in the pharmaceutical field. During the last few years there's been a surge in academic interest regarding drug delivery with the aid of AM techniques. This technology offers a unique way for materials to be utilized in novel formulations. AM manufacturing allows for the usage of materials and compounds in the development of formulations, in ways that are not possible with conventional/traditional techniques in the pharmaceutical field, e.g. tableting, cast-molding, etc. Moreover, one of the major advantages of 3D printing, especially in the case of fused deposition modelling (FDM), is the personalization of the dosage form that can be achieved, thus, targeting the patient's specific needs. In the not-so-distant future, 3D printers are expected to reach hospitals and pharmacies in order to provide on demand production of personalized formulations according to the patients' needs.


title: 3D printing

text: In 2018, 3D printing technology was used for the first time to create a matrix for cell immobilization in fermentation. Propionic acid production by "Propionibacterium acidipropionici" immobilized on 3D-printed nylon beads was chosen as a model study. It was shown that those 3D-printed beads were capable of promoting high density cell attachment and propionic acid production, which could be adapted to other fermentation bioprocesses.


title: 3D printing

text: In 2005, academic journals had begun to report on the possible artistic applications of 3D printing technology. , domestic 3D printing was reaching a consumer audience beyond hobbyists and enthusiasts. Off the shelf machines were increasingly capable of producing practical household applications, for example, ornamental objects. Some practical examples include a working clock and gears printed for home woodworking machines among other purposes. Web sites associated with home 3D printing tended to include backscratchers, coat hooks, door knobs, etc.


title: 3D printing

text: 3D printing, and open source 3D printers in particular, are the latest technology making inroads into the classroom. Some authors have claimed that 3D printers offer an unprecedented "revolution" in STEM education. The evidence for such claims comes from both the low-cost ability for rapid prototyping in the classroom by students, but also the fabrication of low-cost high-quality scientific equipment from open hardware designs forming open-source labs. Future applications for 3D printing might include creating open-source scientific equipment.


title: 3D printing

text: In the 2010s, 3D printing became intensively used in the cultural heritage field for preservation, restoration and dissemination purposes. Many Europeans and North American Museums have purchased 3D printers and actively recreate missing pieces of their relics and archaeological monuments such as Tiwanaku in Bolivia. The Metropolitan Museum of Art and the British Museum have started using their 3D printers to create museum souvenirs that are available in the museum shops. Other museums, like the National Museum of Military History and Varna Historical Museum, have gone further and sell through the online platform Threeding digital models of their artifacts, created using Artec 3D scanners, in 3D printing friendly file format, which everyone can 3D print at home.


title: 3D printing

text: The application of 3D printing for the representation of architectural assets has many challenges. In 2018, the structure of Iran National Bank was traditionally surveyed and modelled in computer graphics software (specifically, Cinema4D) and was optimised for 3D printing. The team tested the technique for the construction of the part and it was successful. After testing the procedure, the modellers reconstructed the structure in Cinema4D and exported the front part of the model to Netfabb. The entrance of the building was chosen due to the 3D printing limitations and the budget of the project for producing the maquette. 3D printing was only one of the capabilities enabled by the produced 3D model of the bank, but due to the project's limited scope, the team did not continue modelling for the virtual representation or other applications. In 2021, Parsinejad et al. comprehensively compared the hand surveying method for 3D reconstruction ready for 3D printing with digital recording (adoption of photogrammetry method).


title: 3D printing

text: 3D printed soft actuators is a growing application of 3D printing technology which has found its place in the 3D printing applications. These soft actuators are being developed to deal with soft structures and organs especially in biomedical sectors and where the interaction between human and robot is inevitable. The majority of the existing soft actuators are fabricated by conventional methods that require manual fabrication of devices, post processing/assembly, and lengthy iterations until maturity of the fabrication is achieved. Instead of the tedious and time-consuming aspects of the current fabrication processes, researchers are exploring an appropriate manufacturing approach for effective fabrication of soft actuators. Thus, 3D printed soft actuators are introduced to revolutionise the design and fabrication of soft actuators with custom geometrical, functional, and control properties in a faster and inexpensive approach. They also enable incorporation of all actuator components into a single structure eliminating the need to use external joints, adhesives, and fasteners.


title: 3D printing

text: Circuit board manufacturing involves multiple steps which include imaging, drilling, plating, soldermask coating, nomenclature printing and surface finishes. These steps include many chemicals such as harsh solvents and acids. 3D printing circuit boards remove the need for many of these steps while still producing complex designs. Polymer ink is used to create the layers of the build while silver polymer is used for creating the traces and holes used to allow electricity to flow. Current circuit board manufacturing can be a tedious process depending on the design. Specified materials are gathered and sent into inner layer processing where images are printed, developed and etched. The etches cores are typically punched to add lamination tooling. The cores are then prepared for lamination. The stack-up, the buildup of a circuit board, is built and sent into lamination where the layers are bonded. The boards are then measured and drilled. Many steps may differ from this stage however for simple designs, the material goes through a plating process to plate the holes and surface. The outer image is then printed, developed and etched. After the image is defined, the material must get coated with soldermask for later soldering. Nomenclature is then added so components can be identified later. Then the surface finish is added. The boards are routed out of panel form into their singular or array form and then electrically tested. Aside from the paperwork which must be completed which proves the boards meet specifications, the boards are then packed and shipped. The benefits of 3D printing would be that the final outline is defined from the beginning, no imaging, punching or lamination is required and electrical connections are made with the silver polymer which eliminates drilling and plating. The final paperwork would also be greatly reduced due to the lack of materials required to build the circuit board. Complex designs which may takes weeks to complete through normal processing can be 3D printed, greatly reducing manufacturing time.


title: 3D printing

text: During the COVID-19 pandemic 3d printers were used to supplement the strained supply of PPE through volunteers using their personally owned printers to produce various pieces of personal protective equipment (i.e. frames for face shields).


title: 3D printing

text: Sped on by decreases in price and increases in quality, an estimated 2 million people worldwide have purchased a 3D printer for hobby use.


title: 3D printing

text: 3D printing has existed for decades within certain manufacturing industries where many legal regimes, including patents, industrial design rights, copyrights, and trademarks may apply. However, there is not much jurisprudence to say how these laws will apply if 3D printers become mainstream and individuals or hobbyist communities begin manufacturing items for personal use, for non-profit distribution, or for sale.


title: 3D printing

text: Any of the mentioned legal regimes may prohibit the distribution of the designs used in 3D printing, or the distribution or sale of the printed item. To be allowed to do these things, where an active intellectual property was involved, a person would have to contact the owner and ask for a licence, which may come with conditions and a price. However, many patent, design and copyright laws contain a standard limitation or exception for "private", "non-commercial" use of inventions, designs or works of art protected under intellectual property (IP). That standard limitation or exception may leave such private, non-commercial uses outside the scope of IP rights.


title: 3D printing

text: Patents cover inventions including processes, machines, manufacturing, and compositions of matter and have a finite duration which varies between countries, but generally 20 years from the date of application. Therefore, if a type of wheel is patented, printing, using, or selling such a wheel could be an infringement of the patent.


title: 3D printing

text: Copyright covers an expression in a tangible, fixed medium and often lasts for the life of the author plus 70 years thereafter. For example, a sculptor retains copyright over a statue, such that other people cannot then legally distribute designs to print an identical or similar statue without paying royalties, waiting for the copyright to expire, or working within a fair use exception.


title: 3D printing

text: When a feature has both artistic (copyrightable) and functional (patentable) merits, when the question has appeared in US court, the courts have often held the feature is not copyrightable unless it can be separated from the functional aspects of the item. In other countries the law and the courts may apply a different approach allowing, for example, the design of a useful device to be registered (as a whole) as an industrial design on the understanding that, in case of unauthorized copying, only the non-functional features may be claimed under design law whereas any technical features could only be claimed if covered by a valid patent.


title: 3D printing

text: The US Department of Homeland Security and the Joint Regional Intelligence Center released a memo stating that "significant advances in three-dimensional (3D) printing capabilities, availability of free digital 3D printable files for firearms components, and difficulty regulating file sharing may present public safety risks from unqualified gun seekers who obtain or manufacture 3D printed guns" and that "proposed legislation to ban 3D printing of weapons may deter, but cannot completely prevent, their production. Even if the practice is prohibited by new legislation, online distribution of these 3D printable files will be as difficult to control as any other illegally traded music, movie or software files."


title: 3D printing

text: Attempting to restrict the distribution of gun plans via the Internet has been likened to the futility of preventing the widespread distribution of DeCSS, which enabled DVD ripping. After the US government had Defense Distributed take down the plans, they were still widely available via the Pirate Bay and other file sharing sites. Downloads of the plans from the UK, Germany, Spain, and Brazil were heavy. Some US legislators have proposed regulations on 3D printers to prevent them from being used for printing guns. 3D printing advocates have suggested that such regulations would be futile, could cripple the 3D printing industry, and could infringe on free speech rights, with early pioneer of 3D printing Professor Hod Lipson suggesting that gunpowder could be controlled instead.


title: 3D printing

text: Internationally, where gun controls are generally stricter than in the United States, some commentators have said the impact may be more strongly felt since alternative firearms are not as easily obtainable. Officials in the United Kingdom have noted that producing a 3D printed gun would be illegal under their gun control laws. Europol stated that criminals have access to other sources of weapons but noted that as technology improves, the risks of an effect would increase.


title: 3D printing

text: In the United States, the FAA has anticipated a desire to use additive manufacturing techniques and has been considering how best to regulate this process. The FAA has jurisdiction over such fabrication because all aircraft parts must be made under FAA production approval or under other FAA regulatory categories. In December 2016, the FAA approved the production of a 3D printed fuel nozzle for the GE LEAP engine. Aviation attorney Jason Dickstein has suggested that additive manufacturing is merely a production method, and should be regulated like any other production method. He has suggested that the FAA's focus should be on guidance to explain compliance, rather than on changing the existing rules, and that existing regulations and guidance permit a company "to develop a robust quality system that adequately reflects regulatory needs for quality assurance".


title: 3D printing

text: Research on the health and safety concerns of 3D printing is new and in development due to the recent proliferation of 3D printing devices. In 2017, the European Agency for Safety and Health at Work has published a discussion paper on the processes and materials involved in 3D printing, potential implications of this technology for occupational safety and health and avenues for controlling potential hazards.


title: 3D printing

text: Noise level is measured in decibels (dB), and can vary greatly in home-printers from 15 dB to 75 dB. Some main sources of noise in filament printers are fans, motors and bearings, while in resin printers the fans usually are responsible for most of the noise. Some methods for dampening the noise from a printer may be to install vibration isolation, use larger diameter fans, perform regular maintenance and lubrication, or using a soundproofing enclosure.


title: 3D printing

text: Additive manufacturing, starting with today's infancy period, requires manufacturing firms to be flexible, ever-improving users of all available technologies to remain competitive. Advocates of additive manufacturing also predict that this arc of technological development will counter globalization, as end users will do much of their own manufacturing rather than engage in trade to buy products from other people and corporations. The real integration of the newer additive technologies into commercial production, however, is more a matter of complementing traditional subtractive methods rather than displacing them entirely.


title: 3D printing

text: The futurologist Jeremy Rifkin claimed that 3D printing signals the beginning of a third industrial revolution, succeeding the production line assembly that dominated manufacturing starting in the late 19th century.


title: 3D printing

text: Since the 1950s, a number of writers and social commentators have speculated in some depth about the social and cultural changes that might result from the advent of commercially affordable additive manufacturing technology. In recent years, 3D printing is creating significant impact in the humanitarian and development sector. Its potential to facilitate distributed manufacturing is resulting in supply chain and logistics benefits, by reducing the need for transportation, warehousing and wastage. Furthermore, social and economic development is being advanced through the creation of local production economies.


title: 3D printing

text: Others have suggested that as more and more 3D printers start to enter people's homes, the conventional relationship between the home and the workplace might get further eroded. Likewise, it has also been suggested that, as it becomes easier for businesses to transmit designs for new objects around the globe, so the need for high-speed freight services might also become less. Finally, given the ease with which certain objects can now be replicated, it remains to be seen whether changes will be made to current copyright legislation so as to protect intellectual property rights with the new technology widely available.


title: 3D printing

text: As 3D printers became more accessible to consumers, online social platforms have developed to support the community. This includes websites that allow users to access information such as how to build a 3D printer, as well as social forums that discuss how to improve 3D print quality and discuss 3D printing news, as well as social media websites that are dedicated to share 3D models. RepRap is a wiki based website that was created to hold all information on 3d printing, and has developed into a community that aims to bring 3D printing to everyone. Furthermore, there are other sites such as Pinshape, Thingiverse and MyMiniFactory, which were created initially to allow users to post 3D files for anyone to print, allowing for decreased transaction cost of sharing 3D files. These websites have allowed greater social interaction between users, creating communities dedicated to 3D printing.


title: 3D printing

text: Some call attention to the conjunction of commons-based peer production with 3D printing and other low-cost manufacturing techniques. The self-reinforced fantasy of a system of eternal growth can be overcome with the development of economies of scope, and here, society can play an important role contributing to the raising of the whole productive structure to a higher plateau of more sustainable and customized productivity. Further, it is true that many issues, problems, and threats arise due to the democratization of the means of production, and especially regarding the physical ones. For instance, the recyclability of advanced nanomaterials is still questioned; weapons manufacturing could become easier; not to mention the implications for counterfeiting and on intellectual property. It might be maintained that in contrast to the industrial paradigm whose competitive dynamics were about economies of scale, commons-based peer production 3D printing could develop economies of scope. While the advantages of scale rest on cheap global transportation, the economies of scope share infrastructure costs (intangible and tangible productive resources), taking advantage of the capabilities of the fabrication tools. And following Neil Gershenfeld in that "some of the least developed parts of the world need some of the most advanced technologies", Commons-based peer production and 3D printing may offer the necessary tools for thinking globally but acting locally in response to certain needs.


title: 3D printing

text: Larry Summers wrote about the "devastating consequences" of 3D printing and other technologies (robots, artificial intelligence, etc.) for those who perform routine tasks. In his view, "already there are more American men on disability insurance than doing production work in manufacturing. And the trends are all in the wrong direction, particularly for the less skilled, as the capacity of capital embodying artificial intelligence to replace white-collar as well as blue-collar work will increase rapidly in the years ahead." Summers recommends more vigorous cooperative efforts to address the "myriad devices" (e.g., tax havens, bank secrecy, money laundering, and regulatory arbitrage) enabling the holders of great wealth to "a paying" income and estate taxes, and to make it more difficult to accumulate great fortunes without requiring "great social contributions" in return, including: more vigorous enforcement of anti-monopoly laws, reductions in "excessive" protection for intellectual property, greater encouragement of profit-sharing schemes that may benefit workers and give them a stake in wealth accumulation, strengthening of collective bargaining arrangements, improvements in corporate governance, strengthening of financial regulation to eliminate subsidies to financial activity, easing of land-use restrictions that may cause the real estate of the rich to keep rising in value, better training for young people and retraining for displaced workers, and increased public and private investment in infrastructure development—e.g., in energy production and transportation.


title: 3D printing

text: Michael Spence wrote that "Now comes a ... powerful, wave of digital technology that is replacing labor in increasingly complex tasks. This process of labor substitution and disintermediation has been underway for some time in service sectors—think of ATMs, online banking, enterprise resource planning, customer relationship management, mobile payment systems, and much more. This revolution is spreading to the production of goods, where robots and 3D printing are displacing labor." In his view, the vast majority of the cost of digital technologies comes at the start, in the design of hardware (e.g. 3D printers) and, more important, in creating the software that enables machines to carry out various tasks. "Once this is achieved, the marginal cost of the hardware is relatively low (and declines as scale rises), and the marginal cost of replicating the software is essentially zero. With a huge potential global market to amortize the upfront fixed costs of design and testing, the incentives to invest [in digital technologies] are compelling."


title: 3D printing

text: Spence believes that, unlike prior digital technologies, which drove firms to deploy underutilized pools of valuable labor around the world, the motivating force in the current wave of digital technologies "is cost reduction via the replacement of labor". For example, as the cost of 3D printing technology declines, it is "easy to imagine" that production may become "extremely" local and customized. Moreover, production may occur in response to actual demand, not anticipated or forecast demand. Spence believes that labor, no matter how inexpensive, will become a less important asset for growth and employment expansion, with labor-intensive, process-oriented manufacturing becoming less effective, and that re-localization will appear in both developed and developing countries. In his view, production will not disappear, but it will be less labor-intensive, and all countries will eventually need to rebuild their growth models around digital technologies and the human capital supporting their deployment and expansion. Spence writes that "the world we are entering is one in which the most powerful global flows will be ideas and digital capital, not goods, services, and traditional capital. Adapting to this will require shifts in mindsets, policies, investments (especially in human capital), and quite possibly models of employment and distribution."


title: 3D printing

text: Naomi Wu regards the usage of 3D printing in the Chinese classroom (where rote memorization is standard) to teach design principles and creativity as the most exciting recent development of the technology, and more generally regards 3D printing as being the next desktop publishing revolution.


title: 3D printing

text: The growth of additive manufacturing could have a large impact on the environment. As opposed to traditional manufacturing, for instance, in which pieces are cut from larger blocks of material, additive manufacturing creates products layer-by-layer and prints only relevant parts, wasting much less material and thus wasting less energy in producing the raw materials needed. By making only the bare structural necessities of products, additive manufacturing also could make a profound contribution to lightweighting, reducing the energy consumption and greenhouse gas emissions of vehicles and other forms of transportation. A case study on an airplane component made using additive manufacturing, for example, found that the component's use saves 63% of relevant energy and carbon dioxide emissions over the course of the product's lifetime. In addition, previous life-cycle assessment of additive manufacturing has estimated that adopting the technology could further lower carbon dioxide emissions since 3D printing creates localized production, and products would not need to be transported long distances to reach their final destination.


title: 3D printing

text: Continuing to adopt additive manufacturing does pose some environmental downsides, however. Despite additive manufacturing reducing waste from the subtractive manufacturing process by up to 90%, the additive manufacturing process creates other forms of waste such as non-recyclable material (metal) powders. Additive manufacturing has not yet reached its theoretical material efficiency potential of 97%, but it may get closer as the technology continues to increase productivity.


title: 3D printing

text: Some large FDM printers which melt high-density polyethylene (HDPE) pellets may also accept sufficiently clean recycled material such as chipped milk bottles. In addition these printers can use shredded material coming from faulty builds or unsuccessful prototype versions thus reducing overall project wastage and materials handling and storage. The concept has been explored in the RecycleBot.


title: N

text: N, or n, is the fourteenth letter in the Latin alphabet, used in the modern English alphabet, the alphabets of other western European languages and others worldwide. Its name in English is "en" (pronounced ), plural "ens".


title: N

text: One of the most common hieroglyphs, snake, was used in Egyptian writing to stand for a sound like the English , because the Egyptian word for "snake" was "djet". It is speculated by many that Semitic people working in Egypt adapted hieroglyphics to create the first alphabet, and that they used the same snake symbol to represent N, because their word for "snake" may have begun with that sound. However, the name for the letter in the Phoenician, Hebrew, Aramaic and Arabic alphabets is "nun", which means "fish" in some of these languages. The sound value of the letter was —as in Greek, Etruscan, Latin and modern languages.


title: N

text: represents a dental or alveolar nasal in virtually all languages that use the Latin alphabet, and in the International Phonetic Alphabet. A common digraph with is , which represents a velar nasal in a variety of languages, usually positioned word-finally in English. Often, before a velar plosive (as in "ink" or "jungle"), alone represents a velar nasal. In Italian and French, represents a palatal nasal . The Portuguese and Vietnamese spelling for this sound is , while Spanish, Breton, and a few other languages use the letter .


title: N

text: In English, is generally silent when it is preceded by an at the end of words, as in "hymn"; however, it is pronounced in this combination when occurring word medially, as in "hymnal".


title: N

text: On the other hand, other consonants are often silent when they precede an at the beginning of an English word. Examples include "gnome", "knife", "mnemonic", and "pneumonia".


title: N

text: In mathematics, the italic form "n" is a particularly common symbol for a variable quantity which represents a natural number. The set of natural numbers is referred to as formula_1


title: Frederick III, German Emperor

text: Frederick III (; 18 October 1831 – 15 June 1888), or Friedrich III, was German Emperor and King of Prussia for 99 days between March and June 1888, during the Year of the Three Emperors. Known informally as "Fritz", he was the only son of Emperor Wilhelm I and was raised in his family's tradition of military service. Although celebrated as a young man for his leadership and successes during the Second Schleswig, Austro-Prussian and Franco-Prussian wars, he nevertheless professed a hatred of warfare and was praised by friends and enemies alike for his humane conduct. Following the unification of Germany in 1871 his father, then King of Prussia, became the German Emperor. Upon Wilhelm's death at the age of ninety on 9 March 1888, the thrones passed to Frederick, who had been German Crown Prince for seventeen years and Crown Prince of Prussia for twenty-seven years. Frederick was suffering from cancer of the larynx when he died, aged fifty-six, following unsuccessful medical treatments for his condition.


title: Frederick III, German Emperor

text: Frederick married Victoria, Princess Royal, oldest child of Queen Victoria of the United Kingdom. The couple were well-matched; their shared liberal ideology led them to seek greater representation for commoners in the government. Frederick, in spite of his conservative militaristic family background, had developed liberal tendencies as a result of his ties with Britain and his studies at the University of Bonn. As the Crown Prince, he often opposed the conservative German Chancellor Otto von Bismarck, particularly in speaking out against Bismarck's policy of uniting Germany through force, and in urging that the power of the Chancellorship be curbed. Liberals in both Germany and Britain hoped that as emperor, Frederick would move to liberalise the German Empire.


title: Frederick III, German Emperor

text: Frederick and Victoria were great admirers of Prince Albert, Queen Victoria's husband. They planned to rule as co-monarchs, like Albert and Queen Victoria, and to reform what they saw as flaws in the executive branch that Bismarck had created for himself. The office of Chancellor, responsible to the Emperor, would be replaced with a British-style cabinet, with ministers instead responsible to the Reichstag. Government policy would be based on the consensus of the cabinet. Frederick "described the Imperial Constitution as "ingeniously contrived chaos."" According to Michael Balfour:


title: Frederick III, German Emperor

text: However, Frederick's illness prevented him from effectively establishing policies and measures to achieve this, and such moves as he was able to make were later abandoned by his son and successor, Wilhelm II. The timing of Frederick's death and the brevity of his reign are important topics among historians. His premature demise is considered a potential turning point in German history; and whether or not he would have made the Empire more liberal if he had lived longer is still a popular discussion among historians.


title: Frederick III, German Emperor

text: Frederick William was born in the New Palace at Potsdam in Prussia on 18 October 1831. He was a scion of the House of Hohenzollern, rulers of Prussia, then the most powerful of the German states. Frederick's father, Prince William, was the second son of King Frederick William III and, having been raised in the military traditions of the Hohenzollerns, developed into a strict disciplinarian. William fell in love with his cousin Elisa Radziwill, a princess of the Polish nobility, but the court felt Elisa's rank was not suitable for the bride of a Prussian prince and forced a more suitable match. The woman selected to be his wife, Princess Augusta of Saxe-Weimar, had been raised in the more intellectual and artistic atmosphere of Weimar, which gave its citizens greater participation in politics and limited the powers of its rulers through a constitution; Augusta was well known across Europe for her liberal views. Because of their differences, the couple did not have a happy marriage and, as a result, Frederick grew up in a troubled household, which left him with memories of a lonely childhood. He had one sister, Louise (later Grand Duchess of Baden), who was seven years his junior and very close to him. Frederick also had a very good relationship with his uncle, the future King Frederick William IV, who has been called "the romantic on the throne".


title: Frederick III, German Emperor

text: Frederick grew up during a tumultuous political period as the concept of liberalism in Germany, which evolved during the 1840s, was gaining widespread and enthusiastic support. The liberals sought a unified Germany and were constitutional monarchists who desired a constitution to ensure equal protection under the law, the protection of property, and the safeguarding of basic civil rights. Overall, the liberals desired a government ruled by popular representation. When Frederick was 17, these emergent nationalistic and liberal sentiments sparked a series of political uprisings across the German states and elsewhere in Europe. In Germany, their goal was to protect freedoms, such as the freedom of assembly and freedom of the press, and to create a German parliament and constitution. Although the uprisings ultimately brought about no lasting changes, liberal sentiments remained an influential force in German politics throughout Frederick's life.


title: Frederick III, German Emperor

text: Despite the value placed by the Hohenzollern family on a traditional military education, Augusta insisted that her son also receive a classical education. Accordingly, Frederick was thoroughly tutored in both military traditions and the liberal arts. His private tutor was Ernst Curtius, a famous archaeologist. Frederick was a talented student, particularly good at foreign languages, becoming fluent in English and French, and studying Latin. He also studied history, geography, physics, music and religion, and excelled at gymnastics; as required of a Prussian prince, he became a very good rider. Hohenzollern princes were made familiar with the military traditions of their dynasty at an early age; Frederick was ten when he was commissioned as a second lieutenant into the First Infantry Regiment of Guards. As he grew older, he was expected to maintain an active involvement in military affairs. However, at the age of 18, he broke with family tradition and entered the University of Bonn where he studied history, law and governance, and public policy. During his time at Bonn (1850–1852), his teachers included Ernst Moritz Arndt and Friedrich Christoph Dahlmann. His time spent at the university, coupled with the influence of less conservative family members, were instrumental in his embrace of liberal beliefs.


title: Frederick III, German Emperor

text: In 1853, Frederick was initiated into Freemasonry by his father, then Prince William of Prussia, and would later become Master of the Order of the Grand Landlodge of the Freemasons of Germany. During his brief reign, he would serve as the patron of the German Freemasons.


title: Frederick III, German Emperor

text: Royal marriages of the 19th century were arranged to secure alliances and to maintain blood ties among the European nations. As early as 1851, Queen Victoria of the United Kingdom and her German-born husband, Prince Albert, were making plans to marry their eldest daughter, Victoria, Princess Royal, to Frederick. The royal dynasty in Britain was predominantly German; there was little British blood in Queen Victoria, and none in her husband. They desired to maintain their family's blood ties to Germany, and Prince Albert further hoped that the marriage would lead to the liberalization and modernization of Prussia. King Leopold I of Belgium, uncle of both Victoria and Albert, also favoured this pairing; he had long treasured Baron Stockmar's idea of a marriage alliance between Britain and Prussia. Frederick's father, Prince William, had no interest in the arrangement, hoping instead for a Russian grand duchess as his daughter-in-law. However, Princess Augusta was greatly in favour of a match for her son that would bring closer connections with Britain. In 1851, his mother sent Frederick to England, ostensibly to visit the Great Exhibition but in truth, she hoped that the cradle of liberalism and home of the industrial revolution would have a positive influence on her son. Prince Albert took Frederick under his wing during his stay but it was Albert's daughter, only eleven at the time, who guided the German prince around the Exhibition. Frederick only knew a few words of English, while Victoria could converse fluently in German. He was impressed by her mix of innocence, intellectual curiosity and simplicity, and their meeting proved to be a success. A regular exchange of letters between Victoria and Frederick followed.


title: Frederick III, German Emperor

text: Frederick proposed to Victoria in 1855, when she was 14 years old. The betrothal of the young couple was announced on May 19, 1857, at Buckingham Palace and the Prussian Court, and their marriage took place on 25 January 1858 in the Chapel Royal of St. James's Palace, London. To mark the occasion, Frederick was promoted to major-general in the Prussian army. Although it was an arranged marriage, the newlyweds were compatible from the start and their marriage was a loving one; Victoria too had received a liberal education and shared her husband's views. Of the two, Victoria was the dominant one in the relationship. The couple often resided at the Crown Prince's Palace and had eight children: Wilhelm in 1859, Charlotte in 1860, Henry in 1862, Sigismund in 1864, Victoria in 1866, Waldemar in 1868, Sophia in 1870 and Margaret in 1872. Sigismund died at the age of 2 and Waldemar at age 11, and their eldest son, Wilhelm, suffered from a withered arm—probably Erb's Palsy due to his difficult and dangerous breech birth, although it could have also resulted from a mild case of cerebral palsy. Wilhelm, who became emperor after Frederick's death, shared none of his parents' liberal ideas; his mother viewed him as a "complete Prussian". This difference in ideology created a rift between Wilhelm and his parents (which was exacerbated by Bismarck's interference), and relations between them were strained throughout their lives.


title: Frederick III, German Emperor

text: Emperor Frederick III was a Lutheran member of the Evangelical State Church of Prussia's older Provinces. It was a United Protestant denomination, bringing together Reformed and Lutheran believers.