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.
All retailers are required to have a Federal Fire Arms license and background checks are required for all purchases made through an FFL. That means all gun show purchases made through an FFL as well.
The “gun show loophole” is a political myth used by politicians on the left to describe a legal purchase through a private sale, which may or may not happen out in the parking lot of some gun show. But not through a licensed vendor.