California's 3D Printer Surveillance Bill Advances Despite EFF Warnings

The California State Assembly has passed AB 2047, a measure requiring 3D printers to run print-monitoring software aimed at blocking the already-illegal, rarely-attempted manufacture of unlicensed firearms. EFF argues the mandate is technically unworkable: amendments quietly downgraded the performance bar from actually stopping a skilled user from evading the system to merely ‘substantially reducing’ circumvention attempts—an admission that the surveillance will obstruct lawful printing while doing nothing to stop a determined bad actor. Oversight has also been weakened, with standards now defined by unnamed third parties and enforcement left to manufacturers and resellers policing themselves.

The revisions sharpen rather than resolve the core problems. The open-source carveout only applies to tools that bundle the mandated print-blocking software, leaving independent developers exposed to vague compliance burdens and individual users at risk of criminal liability for ordinary tinkering. A separate exemption hands the entertainment industry a pass for props and costumes, but indie filmmakers, cosplayers, and small shops get nothing—a split that doesn’t map onto how these general-purpose machines are actually used. EFF notes one genuine improvement: the bill no longer criminalizes reselling printers bought before the mandate took effect.

The broader stakes are privacy and IP exposure. Because every print would be surveilled, any business using a consumer-tier machine risks leaking prototypes and proprietary designs to printer makers, government snoops, or the public via data breaches—while a pricier ‘commercial’ tier lets manufacturers upsell and lock in business customers. EFF is urging Californians to press their state senators to vote the bill down as it moves to the Senate.