The issue is that it is easier to do it the old-fashion way than to dick around with a 3d printer. The result will be far superior as well. For the 3d printed

The issue is that it is easier to do it the old-fashion way than to dick around with a 3d printer. The result will be far superior as well. For the 3d printed lowers: drilling out your own 80% lower will give you a superior result with far less equipment. For the 3d printed "Liberators": a quick trip to your local Home Depot's plumbing and hardware departments will let you throw together a shotgun, not a dinky little pistol, that probably won't blow up in your hand (still possible if you choose the wrong pipe I suppose, but compared to the plastic gun?....) There are videos on youtube of teenagers in the Appalachians doing exactly this just for the hell of it. It doesn't require any real manufacturing skill.