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.
Tbh, you print em right they'll last a good 2k rnds and you can rifle the barrel with ECM at home these days, they'd get "the job" done, save an extended firefight, and then "NY reload."
That said I agree this is pointless.