comment: >
  
  It’s not that easy and the part will still probably require post printing machining.
context: This is a really good thing.
  I own guns and I built a Glock knockoff.  It's stupid easy, and all the parts for a functional gun were mailed to my house.  Took less than an hour to do it all. >
  
  
  This is a really good thing.
  
  It's a largely useless thing.  3D printing exists and will make perfectly serviceable receivers for guns. >
  
  3D printing a handgun is currently a lot more involved than mail ordering a Polymer 80 kit and removing a few bits of plastic.  Of course this ruling won’t completely prevent illegal possession of handguns, but it will reduce distribution to people who are prohibited from possessing firearms.  If 3D printing becomes cheap and easy enough for anybody to do it, then that’s a different issue to address. >
  
  
  If 3D printing becomes cheap and easy enough for anybody to do it, then that’s a different issue to address.
  
  it already is.  you can print anything in metal too now, and 3d metal based printers are getting cheaper all the time.  you can print in resin that has metal powder in it, bake it, and end up with a sintered metal part.  this can be done in any resin printer.  the fancy laser/layer metal dust printers are getting cheaper too.