A law student in Texas wants to make a handgun using a device that prints out 3-D objects using melted plastic. Cody Wilson asked people for money online and got $20,000 to try it. His aim is to prototype this so-called "Wiki Weapon" and make the plans freely available to anyone online. It's open source weaponry. It's also a example of how 3-D printing could change society even as it begins to revolutionize manufacturing.