As a non-US gun owner and 3d printing hobbyist who has done some metal working. 3d printing a gun is one of the harder ways of doing so. The issue is that guns are not hard to make in today’s world, it has been demonstrated that “hard” gun control does not work. The two best examples of “hard” gun control are Japan and the UK and both have examples of how unrealistic these are, In Japans case a homemade gun was used to kill Shinzo Abe and the UK (you would think I would use the troubles but no) is best summed up by a man named Philip Luty who was an anti gun control activist who published a book on how to make automatic firearms in a shed.

You hit the nail on the head with solving though social policies however. Even a simple gun licensing program and mandatory safety training can turn a nation of idiots with guns (the US) into a nation that has gun owners in it (like Italy or malaysia. I don’t think gun violence is going away, it is now a part of the human condition. What can be done is to not hand out firearms like candy and tie the idea of a nations “safety” or “freedom” to that of firearm ownership.