The world's first printable gun was downloaded 50,000 times on its first day. The United States was naturally one of the biggest downloaders, but Spain of all places was ahead.
I love how the gun grabbers are fuming over this. As far as I can tell, the cost of CNC machines is coming down, so at some point it may even be possible to print metal guns. Or at least print molds for casting. This is the beginning of the end of the government monopoly on force..