"Cody Wilson has a simple dream: To design the world’s first firearm that can be downloaded from the Internet and built from scratch using only a 3D printer–and then to share it with the world."
http://www.forbes.com/sites/andygreenberg/2012/08/23/wiki-weapon-project...
http://defensedistributed.com/products/
Still not practical until sufficiently robust materials can be printed, but that evolution is of course occurring in parallel. Designs intended to function well on 3D printers might need a few years of testing anyway before being ready for primetime.
—
