Tbf, you only have to print the regulated part, or lower. They aren’t fully printed and are fully functional, and have been recovered from crime scenes before. Furthermore it isn’t illegal to print or mill your own guns, it’s illegal to sell them, and if a shop works on them for any reason they have to serialize them, but you can make them to own yourself as long as you can legally own them anyway.

That said this law is stupid and will solve nothing, for sure, I agree. The most common way guns are illegally acquired is still straw purchasing (though contrary to popular belief it is illegal to buy a handgun in another state federally, and most states follow the same protocol with long guns too, they all usually have to be shipped to an ffl in your state where your transaction is processed, FBI check, all that. Even if a state sells long guns to out of state IDs, they have to follow all the same laws as the state the ID is from, too, including feature bans and waiting periods).