“The Wiki Weapon project lead by Cody Wilson of Defense Distributed is the first major attempt to develop plans for a 3D-printable firearm. As he states in his video introduction, the idea isn’t new or original, but despite years of discussion, nobody has actually worked out all the details, at least not publicly.
And the plans will be open-source, like software, compatible with open-source CAD software, free for anyone to use, update, modify and share. The long-term goal is to make a reliable, hopefully reusable firearm using nothing more than a RepRap, an inexpensive 3D printer that is designed to be able to replicate all the parts needed to replicate another RepRap, which is also open-source, free for all.
Unlike other recent 3D-printed firearms, the Wiki Weapon standard eventually calls for no non-3D printed parts. Other people have used 3D printers to manufacture AR-15 lower receivers at home, which legally speaking counts as a firearm, but then use off-the-shelf parts and complete upper receivers to build a functioning rifle. Anyone with any AR experience knows that a lower, without the commercially-produced parts, is just a paperweight with a serial number.
So with that idea in mind, Wilson took the idea public. Here’s his introduction.”