Three-D printers produce objects by spraying thin layers of plastic, metal or ceramics that build into shapes. Industrial companies use them to make parts. Gun components have been made that way and used in guns that successfully fire bullets. Now a law student in Texas has set off a raging controversy with plans to completely print a functional weapon and release the specifications free on the Internet. The Wiki Weapon project raises the possibility of a convicted felon making a gun without needing a permit or a kid in the bedroom making a gun while parents think he or she is "playing video games on line." John Biggs is East Coast Editor of Tech Crunch.