This would be an unconstitutional law, per Bruen.
I read the discussion and thought "yeah that's nerd talk, just not about analogue synthesizers, old Landrover gearboxes, or Pascal compilers".
I guess the reason for blocking 3D printers from making gun parts is because it's easier than doing it "by hand". All you really need to do is get a copy of the files from someone who has them, print it out in something suitable, and you have viable gun components with very little "real work" involved.
By contrast here in the UK, where it's quite surprising what you're allowed to own and operate if you comply with the laws (here you're allowed fully automatic weapons, if you keep them at a suitable shooting range and don't try to wander around town with them, and you're not oh maybe a convicted violent criminal for example) one of my late father's friends was a gunsmith. My dad was an excellent machinist, and so he made some components for his friend, and I remember standing in the machine shop where they worked while he turned a chamber for a gun his colleague was building in the lathe. "There you go," he said, taking it out of the chuck, "that's legal".
Then he took it over to the mill, and cut a couple of holes and slots that would allow it to actually function as a chamber, "And there - now it's *illegal*."
Then, as he handed it to his friend, who was licensed to have "home made" gun parts, to stamp his initials on, "And now it's legal again."
Of course since people aren't allowed to just walk around with handguns since the school shooting, it's all a little more difficult - but the police will tell you what you need to do to keep it legal.
It's still slightly easier to get a shotgun licence than a motorcycle licence here.
I think you're overstating this. My understanding is that here in GB (unsure about NI) fully automatic firearms are absolutely prohibited with only limited exceptions that the general public are typically ineligible for. Could you elaborate?
This is not an easy or inexpensive thing to set up.
I shot a documentary about a guy doing just that in NE Scotland, about 20 years ago, and while his range is still in business I don't think he has ever cleared the tape for redistribution - it was a "here's what you spent your money on" for the investors.