California ghost-gun bill wants 3D printers to play cop, EFF says

What the bill would do

It has been reported that AB 2047 would require 3D-printer manufacturers to embed or support a state-certified algorithm that scans design files and blocks anything that looks like a firearm component. On paper the idea is simple: stop untraceable guns before they’re printed. In practice the law would force manufacturers to sell printers that only work with approved software, verify devices against a state allow-list, and punish owners who circumvent those checks.

Technical and civil‑liberty objections

Advocates at the Electronic Frontier Foundation say the plan is technically infeasible and ripe for abuse. They argue proprietary slicer software will become the default, open-source projects will be sidelined, and everyday printing data could be swept up into vendor logs — allegedly opening the door to surveillance or even copyright enforcement by third parties. Cliff Braun and Rory Mir warn that a blacklist approach is brittle: tiny edits to a model or its G-code can evade detection, while the “constantly expanding blacklist” could creep beyond guns into other design categories. Makers are angry; the open‑source community feels the chill.

Stakes and aftermath

Supporters counter that stronger rules are needed to reduce ghost guns and improve public safety. Fair point — gun crime trends in the US are a real worry. But do we want firmware acting as a judge and jury? If AB 2047 becomes law, it could reshape who gets to make things at home, and what counts as lawful creativity. Expect a bruising debate as the bill moves through Sacramento — and yes, someone will inevitably cite Nintendo when the conversation turns to copyright and control.

Sources: The Register