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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.
Why would I? If you knew what a zip gun was for you'd realize how ignorant that question is.
Regardless, here's a historical zip.
I think Japan had a recent situation with a hand made firearm as well.
Okay, so not how criminals and terrorists get their guns, because they just walk into a shop and buy them.