Someone should dig into who this is coming from and why. The answers are usually either (a) they got paid to do it by a company selling the tech, which appears not to be the case here, or (b) they went insane on social media.
(can't confirm this personally, but it seems from other comments that it's perfectly feasible to just drive out of New York State and buy a gun somewhere else in the gun-owning US? And this is quite likely where all the guns used in existing NY crime come from?)
I would also note that the Shinzo Abe doohickey wasn't 3D-printed.
However, in practice the police continually take and often destroy legally owned antiques claiming they are zombie swords.
The law is written in such a way the police can take anything and you have to prove to a judge they aren't illegal.
One very large example of such police practices: https://m.youtube.com/watch?v=RPm4Pts23Qg