Comment by rolph

so you print, until just before it looks like a fire arm, then you cnc till its finished.

or you break the printing up into a number of smaller projects, with thier own zero point. and if required cnc away what will look like part of a firearm, so the printer wont see it.

and there is of course, the use of a template to finish by hand.

and then you would have to regulate blueprints, then diagrams, then X/Y/Z/ feed tables, then you would need to regulate the allowed precision of a measurement device, then regulate posession of machinists tools, like locksmithing.

i didnt mention false positives, thats a good way to hobble 3D printing in general, if too many projects trigger the "its part of a firearm" hook.

oh i just considered, they should do something about EM waveguides, and resonant cavities, pre-emptively so there is regulation before too many people realize just how simple a discombobulator really is to engineer and construct.