San Diego County jumped into California’s sprawling ghost gun fight this week, suing a 3-D printing filament manufacturer it says hocks material for homespun firearms in violation of state law.
Working with the Giffords Law Center, the county counsel sued manufacturer Polymaker, alleging the company made a “strategic business choice” to market and sell 3-D printer filament to Californians for the express purpose of building illegal weapons. The polymer filament is sold in spools that feed into 3-D printers, allowing the devices to form designs created by their owners.



Polymaker is a Chinese supplier, selling to California residents, while also running ad campaigns through ghost gun content creators aimed at California residents, defining themselves explicitly as a ghost gun ingredient.
If they didn’t want to get caught up in this, they shouldn’t have gotten involved in the illicit arms business. But they wanted to be known as the plastic supplier that is cool with you making ghost guns, and that isn’t going to fly in California.
Plastic suppliers that don’t advertise themselves explicitly as being part of the ghost gun supply chain will be fine.
So polymaker actually choose the individual channels their ads (not about ghost guns) were put on…or was that an algorithm (AdSense)?
they have a specific partnership with a 3D2A channel The 3D Print General off the top of my head
Will be fine, for now.