If I may make an analogy -- I do not have a lot of artistic skill, but using my simple laserjet printer, I can print a copy of da Vinci's "Mona Lisa". I push the button, and there she is.
With a 3-D printer, any schmuck can push a button have a gun. That's a gamechanger.
The ability is out there. I'm just a friggin cook. I've got an uncle who is a genius on machine tools.
They can whine, they can complain, but they really, really can't ever stop it once the knowledge is out there.
In the long run, I think truth and freedom will win.
/johnny
Really? A 3D firearm with a plastic barrel and trigger mechanism?