Lots of dup threads out now. Someone else mentioned on another, what makes the U.S. gov think only Americans are doing these things? Cat is out of the bag. Others around the world will make 3D printers, as well as improved designs of downloadable guns. And then they'll slip over the border into the U.S. After all, Obama ain't stopping traffic over the border. He's sending metal guns into Mexico, and plastic guns will come from Mexico.
Excellent point!