Article covers a guy that build a pistol, that basically has all the innards of a glock. But the exterior is 3D printed design. So the “shell” for the gun is 3D printed, but all the working parts are normal gun parts. The article points out that this is a way folks can get around the gun control laws (um…duh you can do this with a trip to Home Depot too and SOO much quicker than days of printing out parts). Oh and after 18 shots, the gun starts to melt.
http://www.wired.com/2016/02/someone-mostly-3-d-printed-a-working-semi-automatic-gun/