"End product is what needs regulation/laws" is, I am afraid, a very narrow view. The degree of difficulty in manufacturing or obtaining (along with operational

"End product is what needs regulation/laws" is, I am afraid, a very narrow view. The degree of difficulty in manufacturing or obtaining (along with operational training) has a significant impact on use (or misuse) of weapons. Printing such objects in your household backyard, for example guns, will surely be a matter of "concern" for authorities who not only have to make laws and design regulation, but also enforce it.