California sues 3D printer filament maker Polymaker over ghost gun marketing
The state alleges that Polymaker deliberately marketed its products to the gun-building community, transforming ordinary printing material into what the law classifies as a firearm component.
California's newly established Consumer Fairness and Public Protection Division has filed a civil lawsuit targeting Polymaker LLC, a major global supplier of 3D printing filament, as part of a broader effort to restrict the manufacture of untraceable firearms. The complaint, filed on October 5, 2026, by San Diego County Counsel representing the state, contends that the Shanghai-headquartered company—which operates from Houston—deliberately promoted its products to appeal to gun enthusiasts, thereby converting standard PLA filament into what state law designates as a firearm precursor part.
Under California statute, a firearm precursor part encompasses "any article marketed or sold to the public to become or be used as the frame or receiver of a functional firearm once completed, assembled or converted," according to the complaint filed in San Diego County Superior Court. The state is pursuing disgorgement of profits, civil penalties and injunctive relief against the company.
The action against Polymaker is part of a larger enforcement push by the Consumer Fairness and Public Protection Division, which is also pursuing cases against Roblox and AppLovin.