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NY bill would require a criminal history background check for the purchase of a 3D printer
(www.nysenate.gov)
This is a most excellent place for technology news and articles.
Makes it look like they're doing something about crime. Doesn't stop anyone from selling or buying them one, though, does it?
Private party transfers of anything can't really be forced to abide background checks. If you want to buy a used printer from your friend you can just buy it, not inform the government, and skirt any background check requirements.
So you want a deliberate "3D printer show" loophole?
Other countries have absolutely no problem whatsoever enforcing background checks for private firearm transfers. Claiming it can't be done is a self-serving lie.