Any competent person with $50 and access to a hardware store can build functional firearms. This didn’t start with 3D printers.

It is 100% legal in the US to build ones own firearms for personal use. Only a few states have put any additional requirements around it.

Building new full auto guns is already illegal without the proper federal licensure. It was already possible for motivated bad actors to ignore this law if they want, even before 3D printing became a moral panic.

There is already zero point to gun control. Can’t stop the signal.