A 3D printer being able to identify what it's actually printing is much harder than it seems. Also, the majority of what gets printed are parts - how do you distinguish between a legal gun owner printing accessories and parts that go towards a ghost gun?

Also, good luck farming off the job to the DOJ right now. The ATF has already mostly shrugged at the prospect of 3D printed guns, and that was before the administration gutted it. I don't think they have any interest/ability to cooperate with tech regulation at this time.

This, like every other bill on the subject that has been attempted from around the country, is bound for a quiet death by committee.