From Bearing Arms:

“3D-printed guns are dangerous because they circumvent existing policies. They are considered “ghost guns,” a term used to describe firearms that do not have an identifying serial number that can be used to match gun purchases to their owner. By law, legal firearms sold in a gun store or by a manufacturer must have a serial number. Printed guns and their parts do not.”

Yes, that’s kind of been my point. That’s why Cody Wilson worked so hard to develop a viable 3D printed firearm. The very point was to make gun control less than useless. After all, gun control has only ever applied to the law-abiding citizen anyway.