The Electronic Frontier Foundation (EFF) is challenging a proposed California bill that would require 3D printer manufacturers to install state-certified algorithms to detect and block the production of firearm components.
AB 2047 aims to curb the proliferation of untraceable "ghost guns" by forcing hardware vendors to police the digital files processed by their machines. If enacted, manufacturers would be legally required to ensure their hardware only operates with state-approved software capable of scanning for prohibited parts.
Technical and privacy hurdles
Policy experts at the EFF argue that the legislation is technically flawed and creates a dangerous precedent for consumer surveillance. Because 3D printers rely on computer-aided manufacturing (CAM) software, known as slicers, to translate digital models into physical objects, the bill would effectively force manufacturers to lock down their ecosystems.
"Under these proposed laws, manufacturers of consumer 3D printers must ensure their printers only work with their software, and implement firearm detection algorithms on either the printer itself or in a slicer software," EFF policy analyst Cliff Braun wrote in a recent blog post.
Braun and his colleague Rory Mir contend that these mandates would effectively kill off open-source alternatives. Since open-source software is often community-driven and lacks the centralized control required for state-mandated filtering, it would likely become incompatible with the required "allow-lists" maintained by regulators.
Beyond the technical feasibility, the EFF warns that the infrastructure required to enforce these rules would grant companies unprecedented insight into user activity. Once a manufacturer implements scanning technology to identify gun parts, that same surveillance apparatus could be repurposed to detect and report copyright-infringing content or other restricted designs.
Proponents of the bill argue that the measure is a necessary step to address gun violence, particularly as 3D-printed firearms become more accessible. While federal law does not ban the personal manufacture of firearms, states like California are increasingly looking for ways to regulate the digital blueprints that facilitate the practice.
However, the EFF maintains that the burden of policing these designs should not fall on the shoulders of hardware manufacturers. They argue that forcing companies to act as digital gatekeepers will erode user privacy and stifle innovation in the 3D printing sector without effectively addressing the root causes of firearm-related crime.
If the bill moves forward, owners who attempt to bypass these restrictions by using unauthorized, open-source software could face criminal liability. The EFF suggests this shift would trap consumers in restrictive, proprietary ecosystems, fundamentally changing how individuals interact with their own hardware.
