Just when I thought I'd seen everything there is to see.... something like this comes along. Really amazing. http://www.youtube.com/watch?v=ZboxMsSz5Aw
Even crazier? You could make your own. Or even buy one from these guys: http://www.makerbot.com/ Back in the day, they had instructions on how to build one yourself. They even figured out how to get these things to make copies of themselves. So you could buy a printer, then have it build you another one