freeform , additive manufacturing equipment , processes and products , including residential , commercial and other buildings . a movable extruder places extrudate that solidifies in open space to create “ scaffolding ” or “ skeletons ” of buildings and other products . elongated extrudate elements are fused to each other or connected by other means to form a cellular structure . filler material such as polymeric insulating foam may simultaneously or thereafter be placed within the cellular structure to contribute desired strength , rigidity , insulative , barrier or other properties . finish materials may also be applied .