Once ' Murican , always ' Murican . <| sep |> I ' m not about to drop test it , but it feels very solid . <| sep |> Because the results would be less shocking . <| sep |> oh , thanks for the ping ! icosahedron will be 20 equilateral triangles , all joined at about 138 table of dihedral angles . so i would bevel the edges of the triangles at half that , or 69 teehee . if your cuts are good , and if the solvent doesn ' t dissolve the acrylic too much , that bevel might be enough to form the shape . if i were making a bunch of these icosahedra at the same size , a snug mold to form half the shape around seems like it would make it much easier to weld , and ensure the angles stay accurate . note i have no experience making this sort of stuff out of acrylic . i think we ' ll also need some dichroic film for the shinies like this s t u fffasaradichroicdfpachill 44 or 48 wide which runs at about $ 50 a foot at 48 . i wonder if the same acrylic solvent can attach that . it would have to not affect the transparency and reflectance that much , or only affect it in interesting ways .