California sues 3D printing filament maker Polymaker over 'ghost gun' allegations
The state of California has sued 3D printing filament manufacturer Polymaker LLC, accusing the company of facilitating the creation of 'ghost guns' by selling materials to firearms enthusiasts.

California's government has filed a lawsuit against 3D printing filament manufacturer Polymaker LLC, alleging the company contributed to the proliferation of 'ghost guns.' The suit claims Polymaker sold materials to firearms enthusiasts that were used to manufacture firearm components.
Under California law, a "firearm precursor part" is defined as any item sold or marketed to the public that, once assembled or modified, becomes or is used as a frame or body for a functional firearm. The lawsuit acknowledges that 3D printing filament is not illegal on its own, but prosecutors argue that Polymaker's actions have aided illegal manufacturing.
Central to the lawsuit is the company's past support for Sean Aranda, a social media personality known as "General 3D Print." Aranda, a firearms enthusiast and 3D printing expert, received sponsorship from Polymaker, including a special edition filament. He has since been hired by Polymaker, reportedly as a senior technical customer manager, a position the state argues is linked to his involvement in the 3D-printed gun community.
The California government is seeking restitution for profits, civil penalties, and injunctive relief against Polymaker. 'Ghost guns' are unserialized firearms that are difficult to trace.