On September 26, 2026, California Governor Gavin Newsom signed AB 2047 (the California Firearm Printing Prevention Act, introduced by Assemblymember Rebecca Bauer-Kahan), as part of a package of ten gun control bills signed that day. California thus becomes the second state in the U.S., after New York, to establish safety standards for 3D printers, with the law taking effect on January 1, 2027. Core requirement: 3D printers sold in California must incorporate 'firearm blocking technology'—via hardware, firmware, or other integrated technical means—to prevent printing tasks from starting until the print file has been evaluated by a detection algorithm and determined not to produce a firearm or conversion device. Implementation is condition-triggered: Starting July 1, 2027, the California Department of Justice will quarterly verify whether ASTM has published an industry standard for blocking technology; if a standard is published and the Department determines the technology is feasible, rules must be issued within 24 months, with sales restrictions taking effect one year after the rules are published (earliest around 2029-2030); if no standard exists by July 1, 2029, the verification obligation terminates and restrictions are never triggered. The final version removed an industrial-grade printer exemption from earlier drafts (retaining only an exemption for film prop-specific equipment), and existing equipment and current users are not affected. Industry impact: Desktop/consumer printers are most directly affected, while whether industrial metal 3D printers will be included in regulation remains uncertain; U.S. printer manufacturers and exporters face increased compliance costs in the California market. Supporters (Everytown for Gun Safety, etc.) emphasize that this measure can close the circulation channels for untraceable 3D-printed firearms; opponents (NRA, Prusa Research founder Josef Průša, Electronic Frontier Foundation) question that detection algorithms can be bypassed and pose risks of false positives. Value for powder buyers: The law regulates equipment sales, not powder use, so there is no short-term direct impact on powder demand; indicators to watch are the ASTM standard development process (which may spur a market for print file detection software and compliance services), and the indirect impact of the California model spreading to other states on the pace of equipment investment in the North American print service market.