Comment by everforward

I doubt it's actually achievable without either either a massive false positive rate or massive false negative rate.

Last I looked, the vast, vast majority of 3D printed firearms were basically just printing the receiver (the part that the government considers "the gun") which is more cosmetic than functional. It holds parts, but isn't pressure-bearing, the firing pin isn't attached to it, etc, etc. Like [1] is the part of a Glock that gets stamped, and you could trivially change every part of that except where the mag goes. You could move the mag button, you could add the slide for the upper afterwards (and would want to anyways, so it can be metal). You could also print snap-off plates over the holes so it looks solid.

I would wager humans would struggle with this given that the people designing the models are actively trying to hide what it is. This is a dedicated community, not really the casual "I'll do it if it's easy" crowd, because it's currently not super simple and easy.

1. https://shop.evosports.com/glock-g1718-lower-receiver-receiv...