California's proposed bill A.B. 2047 aims to mandate censorware on 3D printers, which would block the printing of certain objects, including firearm parts. The bill would also criminalize the use of open-source alternatives and impose significant burdens on manufacturers and consumers. Critics argue that this legislation will stifle innovation, limit consumer choice, and create new cybersecurity risks. The bill's provisions are seen as overly broad and likely to be ineffective in achieving its intended purpose.