

Interesting read. I did not know about the honestly horribly ineffective (if not outgright dysfunctional) legislation in much of the US in this regard. I was however having functional arguments in mind though. The functional core components of a Glock are not made from organic polymers, for a reason.
Yes, printing the frame of a firearm is perfectly feasible. But if you don’t know your tool and its materials, you are putting yourself at risk. It is really like with all those other tools that can produce such a frame just as well. But then, if you say most people print it with PLA you might have a strong point that most people 3d printing that don’t know what they are doing or don’t care about PLA’s serious limitations for that application, and do it anyway.
PS: I wouldn’t consider using a 3D printed jig … and ECM as a part being produced by 3d printing. A helper part is for producing it by other means is 3d printed. Again, plenty of alternative methods to do so. Are they all going to be restricted?





PLA is a poor material choice for the application but an easy one. So they might not care. I am not saying that it is dysfunctional, just not a good choice.
PLA hydrolises over time, and becomes brittle and is sensitive to UV, ie day light. It is enough to leave it in a sunny place with some glass reflection for it to soften up and deform but the worst features is probably that unlike many other polymers it tends to fail catastrophically, when it fails, ie nothing much happens until it snaps and splinters. Its impact resistance is also comparably poor.
You seem to run in doors that are open. My whole point was that 3d printing is not suitable to create the functional parts of a fire arm, and by that I mean creating it directly with 3d printing, not some helper products and I also mean for hobbyist levels. Maybe with metal 3d printing etc more is possible but that is neither easy nor cheap nor readily available in anyone’s basement. It is easier to get your hands on a CNC and probably cheaper too.
If your argument is that for what 3d printing can be used, it is a fairly easy method and can enable cost effective low number production, yes it can. So yes, if you will, then it has made it more accessible for those things. If someone want to regulate private firearm construction however, just regulate private firearm construction. Don’t outlaw open 3d printers, CNCs or if we are at it, woodwork tools.