Although there’s a fellow or two out there with plans that (they say) could be used to control milling machines to duplicate Real Guns (TM), everyone’s focused right now on the so-called “Liberator,” a printable resin gun that, like its WW2 namesake airdropped to the French Resistance, holds and fires one shot at a time and shoots marginally better than no gun at all. Me, I think the early adopters are going to have more problems than the gun is worth.