California's A.B. 2047 requires all 3D printers to include mandatory software that blocks printing of firearm parts, and makes it a misdemeanor to disable or modify this blocking system — effectively criminalizing open-source printer firmware. EFF argues this mirrors failed DRM strategies from 2D printing by locking users into manufacturer ecosystems, enabling planned obsolescence, and preventing device repair or resale. The legislation creates a California DOJ bureaucracy to certify print-blocking algorithms and maintain banned-blueprint databases, raising compliance costs that disproportionately burden smaller manufacturers and consumers. One gap: the article compares A.B. 2047 unfavorably to Washington and New York bills but those comparisons can't be verified here.