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.
Or just buy parts. What are they gonna do? Regulate stepper motors and heater cartridges, and generic microcontrollers?
The cat is already out the bag.