https://qz.com/1344798/3d-printed-guns-are-legal-in-the-us-but-homemade-guns-are-nothing-new/

Tomorrow, theoretically, building an untraceable gun in the US will be about as easy as downloading a song from iTunes.

From Aug. 1, you’ll be able to log onto websites like Defense Distributed and download a design file that you can use to produce a working firearm on a $200 3D printer in a couple hours. Thousands have already accessed such files. Unsurprisingly, this has gun-safety activists worried. Even the president is “looking into” it.