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.
You can make a gun with anything
Fine, hard mode challenge: tissue paper!
Give me water, corn starch and a hydrolic press
Well, not anything (if you actually think that’s possible, then I have a challenge for you: make a functioning gun out of cheese), but an average hardware store should have everything you need to produce something capable of firing a shot.
Usually part of 3D printed guns aren’t 3d printed. I’d bet you could make a one-time-use gun out of cheese, but the firing pin and springs would probably have to be made of something else to use a traditional round.
If you go with a gunpowder charge ignited with a flame, it’d be much easier. I’m sure there’s even a cheese that could sustain a flame to ignite it with too. You could even make a cheese bullet.
The future of warfare: dairy.