[servo1969]

#26

Somebody needs to invent a plastic-like material a person can print with that, when baked in an oven for a few hours, turns hard as steel.

[LesbianThespianGymnasticMidget]

http://www.optomec.com/Additive-Manufacturing-Technology/Laser-Additive-Manufacturing

Wait till this gets cheaper.

[CurlyDave]

Somebody needs to invent a plastic-like material a person can print with that, when baked in an oven for a few hours, turns hard as steel.

Can't quite do that yet, but if we printed soft, low melting waxy resins, we could use them to produce cast metal parts by using the "lost wax process". Look it up. It is not some arcane, long-lost technique. The idea is to make a wax model of what you want to cast, coat it in ceramic, and the ceramic becomes a mold to cast the metal object.