You Can 3D Print A Heavy-Caliber Gun -- And It's Totally Legal. March 27, 2015 / 2:46 PM PDT / CBS San Francisco ... Advanced 3D-printing technology now allows for people to make durable guns.

The world's first 3D printed gun has come and gone. It fired a shot, but was made of plastic and broke down very quickly. Further revisions of the gun had it last a little longer but the weapons ...