3D printers turn regular guns into machine guns. Feds are cracking down.

3D printing is the process of building three-dimensional objects by layering materials using computer-aided design models, according to 3D printing company Formlabs.

"I don't want this to happen again." Wildfire survivors turn to 3D-printing tech to create disaster-proof housing: 'It's going to be amazing' first appeared on The Cool Down.