Good. Punish the cartel.

“3d printing guns” isn’t about the pressure holding parts, it’s about the traceable serial number holding parts. On most firearms the “lower assembly” or “receiver” (frame, trigger group, feeding assy) is legally considered the firearm and is what bears the serial. Most of those can be printed and use off the shelf hardware to work, albeit with a much lower lifespan.
Pressure containing wear parts that are meant to be exchanged (barrel and breech bolt) typically do not carry serials and are thus not normally traceable. If you eliminate the serialized, traceable part of the firearm, then any collection of parts could be used.

That said, eliminating an entire hobby and industry because gun serialization laws haven’t been updated in a hundred years is probably not the right way to do it.

Provably never, as it’s the chicken-and-egg app availability problem that killed Nokia and Windows phone. Everything is developed for Android, at this point if you launch a new phone OS it’s just going to sit at 0.01% marketshare of weird nerds buying it until you go bankrupt because you can’t afford to buy the hardware anymore.