Class Discussion ; 3D Printers

The idea of 3D printers absolutely amazes me. I don't understand how someday, there will be a way to print out 3-Dimensional objects made of anything. So many questions are running through my mind when thinking about this.Can we print food? Money? Clothes? One thing we discussed was the fact that it may be possible to print out drugs or guns. That isn't a good thing whatsoever. First of all, the drugs that people would print would most likely be illegal and printing guns would be dangerous! I'm sure normal people would print guns for hunting purposes, but who's to say that psychotic killers couldn't get access to a 3D printer and print guns to kill people? Simple 3D may exist already, but there is so much to think about when it comes to inventing the more complex versions.