Unlikely as people are already producing semiautomatic firearms with consumer level 3d printer technology. There are even competitions out there already such as the Makers Match.

There are some firearms part manufacturers that utilize 3d printing for part production. The company that made the first fully printed .45 1911 handgun uses printers to produce parts for sale.

I grew up in the rural midwest so my firearm experience goes back to the single digits of age. It was expected I would take the firearms and hunter safety courses that the state provided. I believe that such courses should at the very least be the minimum required for anyone purchasing a gun.