California wants 3D printers to detect gun parts. Here's why that can't work (the3dprintingnerd.com)
California's AB 2047 would require 3D printers sold in the state to run state-certified detection that blocks firearm blueprints, with disabling it a crime, phased in 2027-2029.
Critics, including engineers in the thread, argue the core ask is technically impossible: a rifled barrel is a grooved cylinder, and so are industrial screws and optical mounts. Split, rotate, or scale a model and the filter is blind. The counter-case: anti-counterfeiting in inkjet printers already exists.
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