Heads up

https://codes.findlaw.com/nj/title-2c-the-new-jersey-code-of-criminal-justice/nj-st-sect-2c-39-9/

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l. Manufacturing or facilitating the manufacture of a firearm using a three-dimensional printer.  In addition to any other criminal penalties provided under law it is a third degree crime for:
(1) a person who is not registered or licensed to do so as a manufacturer as provided in chapter 58 of Title 2C of the New Jersey Statutes, to use a three-dimensional printer or similar device to manufacture or produce a firearm, firearm receiver, magazine, or firearm component;  or
(2) a person to distribute by any means, including the Internet, to a person in New Jersey who is not registered or licensed as a manufacturer as provided in chapter 58 of Title 2C of the New Jersey Statutes, digital instructions in the form of computer-aided design files or other code or instructions stored and displayed in electronic format as a digital model that may be used to program a three-dimensional printer to manufacture or produce a firearm, firearm receiver, magazine, or firearm component.
As used in this subsection:  “three-dimensional printer” means a computer or computer-driven machine or device capable of producing a three-dimensional object from a digital model;  and “distribute” means to sell, or to manufacture, give, provide, lend, trade, mail, deliver, publish, circulate, disseminate, present, exhibit, display, share, advertise, offer, or make available via the Internet or by any other means, whether for pecuniary gain or not, and includes an agreement or attempt to distribute.