When 3D printers are outlawed only outlaws will have 3D printers.
I’ve looked into 3d printers for home use, mainly to learn for myself. It is on the list of stuff.
Actually, I thought that the capability of printing out quick versions of printed-circuit “boards” for prototyping useage would have caused many in the electronics industry to call for even more drastic regulations for the regular 2D printer alone, but so far its limitations have not been deemed that much of a problem for many so knock on wood.
Anyone with a Dremel tool and access to info on the receivers that one wished to construct has been able to do this for some time now, or even easier with access to a small milling machine. Said machines not being inexpensive being the main limitation there. This is just a more dedicated machine for ease-of-manufacturing purposes.
Look for attempts to bypass the current laws on the books and then outlaw the personal construction of firearms to quickly follow.
Except that this machine is not a 3D printer. It's a computer controlled milling machine.
I'd be very wary of any metal firearm created with a 3D printer.