Yeah, the tech isn’t there quite yet, but it’s inevitable. It’s likely an easy solution to deal with, though like all else, there’s work arounds.
For drones, they have a chip that keeps it from flying into regulated air space like airports. For scanners, they have some shit that blocks you from scanning currency. This will be more of the same.
For now the tech is new, so it’s possible to print one out. From what I’ve seen, it’s a single use weapon, but does work. For the most part, it’s more of a plastic zip gun than anything resembling a true firearm.
But handmade guns guns can be amazing. In fact, some of the best 1911s I’ve heard of are literally custom made, one at a time. I think the real issue with “ghost guns” is more about the quality of the tooling and the experience of the user making it (or lack thereof). Would love to get into it myself, but have too much on my plate as is and if I was going to do it, I’d ensure I had the right tools, which no doubt cost far more than I can throw at it. Just don’t have the time or money for a hobby that deep. That said, I do reload ammo though. Anyone else into that?