California to mandate firearm-blocking technology in future 3D printers

California has passed legislation requiring manufacturers to integrate firearm-prevention technology into future 3D printers sold within the state. The law specifically targets new units, exempting existing machines and their owners from any retrofitting requirements. The mandate will only take effect once ASTM International establishes a formal technical standard for identifying firearm designs, a process the California Department of Justice will monitor through 2029. Critics, including the Electronic Frontier Foundation, have raised concerns regarding the technical feasibility of such detection systems, noting that distinguishing between weapon components and legitimate mechanical parts remains a significant challenge. By joining New York in this regulatory approach, California seeks to curb the production of untraceable firearms. However, the law's practical implementation remains contingent on the development of reliable software capable of identifying prohibited designs without impeding the ordinary operation of 3D printing equipment.