Handheld Railgun: Video shows first portable railgun, fires plasma | BGR Lunatic, Genius, or Massive Homeland defence problem... Only time will tell. I had heard of a gun being printed, but rail guns are way more awesome. I'm now wondering if a 3D printer can 3D print a 3D printer. (Would that count as Meta?) Also, should we be keeping robots and these things apart, once they can self replicate the only thing they will need us for is to pay the electricity bill and change their battery/cambelt every 3 years.