Handguns. It’s now possible to use a cheap 3D printer to make a gun. Nothing so easy as far as bullets go, however, which you’ll still need to actually shoot somebody. There’s been lots of hand-wringing about the potential for crims (and maybe kids) to print a gun, but instead of restricting the know-how, why not restrict the sale of ammo instead?
*Disclaimer. CRN and its publisher Haymarket Media in no way condones the application of 3D printing technology for illegal activities.