Surely, you jest?
Gonna be hard to do. As long as lathes, CNC mills, rotary tools are still game, all is good.
People who are knowledgeable about firearms and machining know that, the problem, is the people who enact our laws, are the ones who usually have the least amount of knowledge about the subject they are regulating.
And then there are the lawmakers who will jump on any chance to create a panic to attempt to regulate guns out of existence and openly discuss the fact that they do so. I can just see one of the leftwing politicians standing in front of a camera on CNN frothing at the mouth, "Any Terrorist can buy one of these printer thingies and push a button and produce a torrent of weapons of war! something must be done!" Yeah.