I've been getting really excited about 3D printing lately, how do you guys feel about it? I'd love to be able to print useful plastic things, one thing that immediately comes to mind is guitar picks. I could fix my broken case fan. Maybe drill bits and tools if the material is hard enough. Or make copies of keys. I read about being able to print receivers for guns, I think that's the part that's technically the firearm, like you can buy a gun online sans the receiver, just print a receiver, and you have an operational weapon without ever leaving your house.