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.
Owning a ghost gun is a crime, right?
Nearly 500 were recovered last year. https://ny1.com/nyc/all-boroughs/public-safety/2023/09/20/nypd-unit-combatting-the-growing-problem-of-ghost-guns
(Ignoring the fact that "ghost gun" is a meaningless and intentionally emotionally charged term)
In New York, yes. In the vast majority of the US, no. It's illegal to file the serial number off an existing firearm, but 100% legal in most states to manufacture your own unserialized firearms for personal use. Just cannot be sold/transferred.
I'd note the article you linked says nothing about how many of those are actually 3D printed, it is infinitely easier to deface the serial number on an existing firearm than it is to 3D print one.
A ghost gun is what Emporio used to escape from Pucci in JoJo's Bizarre Adventure: Stone Ocean
From the picture in that article, those guns would blow up in the shooter's hand.
What a shame that would be