It will, because the printing technology is going to be pushed by plenty of forces beyond the desire to print guns.
I just imagined a scenario where, perhaps, the government requires a control to be built into printers that prevents them from printing known gun parts. But then I also imagined Crafty Hacker Guy cracking that on day 1 and posting the instructions on how to unlock your printer in his blog.
In other words, I feel it's inevitable and not worth fighting against.
I would prefer energy go towards solving social issues that make people feel the need to have a gun for self defense in the first place.