This seems like a plainly bad idea, though that doesn’t lessen the chances of it becoming law. In practice, it’s silly — building 3D printers side steps it, yes? Can I print nothing when the registry of banned prints is down, as it will very often be as government run software that doesn’t generate revenue. Oh, of course there will be a printing tax to cover the costs passed later. A comic tragedy.

Edit: typo

So what stops someone using a blocked printer to print an unblocked printer to print a gun?