The 3-D printing revolution is coming and it's changing the world already. Click here for a primer on 3-D printing and what it can do now and in the future, then take a look at these amazing videos of 3-D printing in action.
One area where it's causing a lot of controversy, however, is 3D-printed guns. The dream of some people - and nightmare of others - is that anyone with a 3-D printer can download a file online and print an untraceable gun made of plastic.
So far that hasn't panned out so well. There are plastic 3-D printed guns out there, like the Liberator, but they fail after one or two shots and aren't that accurate.
While durability and accuracy is being worked on, however, the creator of the Liberator, Defense Distributed, has another trick up its sleeve.