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.
Just with household items you could already come up with half a dozen options that are better than a gun, kitchen knife, or explosives.
Security is fragile and we are kind of lucky that there aren’t too many intelligent manicas.
If any of those (conspicuously unnamed) household items were used to kill even half as many people as guns, there would absolutely be legislation to reduce the public safety risk.
If that legislation failed as routinely as America’s gun laws do, it would be improved or replaced until it worked.