You can't 3D print the bullets. Thus I'd speculate that this development does not significantly impact the effectiveness of gun control laws nor does it accomplish the goals of the creator.
Could someone who had a printer and the downloaded file skip that part? Yes. But they could possibly be fined and jailed for up to 5 years.
http://www.gpo.gov/fdsys/pkg/STATUTE-102/pdf/STATUTE-102-Pg3...
> “Everyone’s seen the movie ‘In The Line of Fire,’ where one of the great bad guys, [played by] John Malkovich, labored at making a gun out of plastic and wood so it could get through metal detectors and he could assassinate the president,” US Senator Charles Schumer said yesterday.
Besides, what non-authoritarian country considers cryptography to be ammunition?
Edit: Looked it up, if you got a license (for either hunting or a shooting club) you can legally have and buy weapons and munition.
Varies from state to state and even county to county. In NYC and many other places, if you're caught with bullets for a gun you aren't permitted to possess, you can be charged with felony possession of ammunition. This is particularly used against those with prior arrests and/or convictions on their record.
But, you know... I am not a lawyer.
Most states, assume 40+, and most of the population, say, 2/3rds+, don't live under such insane restrictions. Looking at the top states by population, California is #1, in the middle of the 8 worst for gun owners, and I'm pretty sure doesn't do this. Don't remember Illinois doing it either. New Jersey, maybe.
To finish, the Feds allow ammo by mail order, the only restriction is the usual "Stick an ORD-M label on the package" and ship by ground. That's about as unregulated as you can get except for the usual age limit.