California Bill A.B. 2047 Seeks to Mandate Firearm-Blocking Tech in 3D Printers

SACRAMENTO – California lawmakers in late February introduced legislation that would require all 3D printers sold or transferred in the state to be equipped with technology designed to detect and block the printing of firearm components. The bill, A.B. 2047, would also make it a criminal offense to disable, uninstall, or otherwise circumvent this state-mandated software. The proposed law aims to combat the proliferation of privately made, untraceable firearms, often called “ghost guns,” by targeting the manufacturing devices themselves. If passed, it would prohibit the sale of any 3D printer unless it incorporates a state-certified algorithm that scans digital design files for gun parts and halts any corresponding print jobs. The bill builds on previous state efforts to regulate the home manufacturing of firearms, including laws that placed restrictions on CNC milling machines and required state and federal licenses to produce firearms with a 3D printer. While the legislation's stated goal is public safety, the approach of mandating censorware on a general-purpose manufacturing tool creates significant uncertainty for the thousands of small and mid-sized businesses that rely on this technology. In our experience, companies across sectors from automotive to medical devices use 3D printing for rapid prototyping, creating custom jigs and fixtures, and even producing finished goods. This bill introduces a fundamental risk by turning a versatile piece of equipment into a monitored, restricted device. The potential for false positives, where the software mistakenly flags a legitimate industrial part as a prohibited item, could cause costly delays and disrupt production workflows. This regulatory overreach threatens to stifle innovation and drive up costs, directly impacting the operational agility that makes additive manufacturing so valuable for SMBs. Navigating these shifting regulatory landscapes is a core component of financial risk management. Businesses using or considering this technology need to assess how such laws could impact their operations and intellectual property. We help clients evaluate these kinds of regulatory risks at C&S Finance Group LLC, and you can learn more at csfinancegroup.com. Under the provisions of A.B. 2047, the California Department of Justice would maintain a list of certified 3D printer manufacturers compliant with the new rules. Beginning March 1, 2029, any person who “knowingly disables, deactivates, uninstalls, or otherwise circumvents” the firearm-blocking technology would be subject to criminal penalties. Opponents argue this measure effectively transforms a user's private property into a device under constant government surveillance. Critics, including the Electronic Frontier Foundation (EFF) and the NRA Institute for Legislative Action (NRA-ILA), contend that for the blocking technology to function, it would need to continuously analyze every design file a user sends to their printer. Because many functional parts, including some firearm components, are composed of simple geometric shapes like cylinders and blocks, the software would be perpetually guessing a user's intent. This could lead to the blocking of legitimate projects, from custom automotive parts to engineering prototypes, that share basic design elements with restricted items. Furthermore, the legislation poses a direct threat to the open-source community that has been instrumental in making 3D printing affordable and accessible. By criminalizing the use of alternative, non-certified software and firmware, the bill would force manufacturers to lock down their machines. This would prevent users from modifying, repairing, or improving their own equipment, a core tenet of the open-source and right-to-repair movements. This shift could end the era of inexpensive, highly customizable printers that have empowered small businesses and entrepreneurs to compete with larger corporations in product development and small-scale manufacturing. Though A.B. 2047 is a California bill, its effects would likely be felt nationwide. Given that California represents one of the world's largest economies, manufacturers may find it economically unfeasible to produce two separate lines of 3D printers—one for California and one for the rest of the country. Industry analysts suggest it is more likely that companies would integrate the mandated technology into all their products, making the California standard the de facto national one. Opposing groups, such as the Gun Owners of California, argue the law is a misguided effort that will fail to deter criminals, who will continue to use the millions of existing printers without this technology or find other means of production. They frame the bill as an infringement on constitutional rights that inserts a state-mandated gatekeeper between citizens and their tools. The broader concern is that it sets a dangerous precedent for regulating other general-purpose technologies, questioning what might be next for CNC machines, computers, or other consumer electronics. The bill is scheduled for a committee hearing on April 14. Its progression will be monitored closely by businesses, technology advocates, and civil liberties groups, as its outcome could have far-reaching implications for the future of digital fabrication and technological freedom in the United States.