The weapon, called "the Liberator" — a homage to cheap pistols distributed by the Allies in France during World War II — is printed on a Stratasys Dimension SST 3D printer. It consists of 16 parts, 15 of which are 3D-printed. The last part — the firing pin — is a simple nail, found in any hardware store.
Wilson is the founder of the company behind the project, Defense Distributed. He claims the project is not about violence, but about freedom. “This is about enabling individuals to create their own sovereign space," he told Forbes.
“I recognize that this tool might be used to harm people. That’s what it is — it’s a gun. But I don’t think that’s a reason to not put it out there. I think that liberty in the end is a better interest,” he said.
http://mashable.com/2013/05/06/3d-printed-gun-fired-on-video/