I guess I'm just smarter than everyone else here?
I can 'print' sugar based rocket propellent, so ...who needs 'guns'?
In fact, if someone wants to put up a $50,000. challenge, I'll 'print' a 10 kTon nuclear warhead. I'm kidding of course, unless... my doing so is not illegal, then I am not kidding. It's just that you folks have not quite adapted to these DIY technologies and are still thinking in terms of machine shop operations and overly precise, skilled labor. If this nuke challenge is too drastic, make it a $10,000. closed house challenge. You get your gun and I'll print my device and we'll get locked into an abandoned house and see who kills who first? Anyone?