Unlike printing guns, which doesn't work, printing ammunition magazines doesn't face any practical problems. Of course, people could always make the magazines using simple tools in any machine shop (after all they are just metal boxes with a spring), but my guess is that these 3D printers will capture attention in a way that the old machine shops didn't. This article is from Metro News: After the tragedies of Sandy Hook and Aurora, the U.S. government is preparing to introduce stricter guidelines on gun ownership. But supporters of the second amendment could get around them by printing their own firearms...