California's AB 2047 would require 3D printer manufacturers to implement state-certified firearm-detection algorithms that block prohibited print jobs. The Electronic Frontier Foundation argues the bill is technically infeasible, would effectively kill open source slicer software by mandating proprietary alternatives, and would create a surveillance infrastructure for users' print files. EFF warns the detection blacklist could expand beyond firearms to cover copyright infringement or political content. Prusa Research says it supports safety but is committed to open source principles and opposes locking down user hardware.
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