People will always want to 3d print a gun. In some cases 3d printing a gun or components to a firearm is an excellent idea. For example, in a rural or exurban environment where parts may be scarce, raw materials to remanufacture failing components of firearms for hunting or defense are more efficient. A farmer may be able to use the same 3d printer to rebuild a thresher, reprint a broken connector, and rebuild a rifle used for varmint hunting to protect his cattle.
there will always be bad guys. bad guys will always want to 3d print a gun that can't be traced and isn't registered. But it bares worth remembering, our present United States method of determining who is fit for ownership of a gun is basically a checklist and a phone call. Given the rash of recent mass shootings this system didn't prevent, its clearly lacking. Any attempt to regulate 3d printing of guns, should come with an overhaul of our background or application process for gun ownership. simply banning the devices, the knowledge, or their export is an ambitious but futile approach to the actual problem: wholesale gun violence in the united states as a manifestation of the permanent race based caste and class system inequality in the united states..