I understand the intent, but feel that there are so many other loopholes that put much worse weapons on the street than a printer. Besides, my prints can barely sustain normal use, much less a bullet being fired from them. I would think that this is more of a risk to the person holding the gun than who it’s pointing at.
Don’t you just need a pipe of the right size capped at one end, and a nail?
Yeah, a 3/4 inch pipe will fit a 12 gauge shell pretty well, and some pipes will stand a lot of psi.
Luty SMG is an improvement on that. For 3d printers check out the FGC 9. Neither are hard.
People also build potato gun powerful enough to put on through a car door and then some