- The ban, if implemented, would mean that any printer without this firearm blocking technology could not be legally sold or transferred in California.
- The measure is still pending Senate review before becoming law.
- It could mean that 3D printers could become more expensive or more restrictive for users in the state in the near future as manufacturers pass additional compliance costs onto users.
The state of California is moving toward enacting a ban on the sale of 3D printers that lack a built-in algorithm that prevents users from producing “ghost guns” on a whim.
The controversial bill was passed last week and is awaiting Senate confirmation before finally reaching California Governor Gavin Newsom’s desk, where it must still be signed.
The measure remains controversial, with critics arguing that it directly impedes innovation and consumer rights and could lead to other forms of government-mandated censorship and control over what users do with their purchases.
A law that can be difficult to implement
California bill AB-2047 has been the subject of controversy since it was first introduced to the Assembly by member Rebecca Bauer-Kahan on February 17, 2026.
Its goal is to establish legal requirements, including mandating that state-approved algorithms be included with 3D printers (at the firmware or application level), which would make it impossible for users to print untraceable 3D printed firearms.
The onus falls on manufacturers, who must submit documentation that their printers contain the “firearm blueprint detection algorithm.”
The bill recognizes the limitations of the task at hand and states that an “acceptably low level of evasion” required by the California Department of Justice will serve as a benchmark for such measures.
Performance standards for the bill have not yet been drafted, and the bill states that the Department of Justice or a “relevant agency” will publish such guidelines by January 1, 2028.
Critics point out that this could, however, be a futile exercise, given that users should, in fact, be able to use open source targeting to bypass such restrictions simply by using a VPN, even if such a restriction were implemented via geolocation, for example.
Proponents of the regulation say the rules will strengthen security by closing a long-standing loophole that has allowed commercial 3D printers to produce untraceable weaponry.
They also cite the murder of United Healthcare CEO Brian Thompson allegedly with a 3D-printed gun by Luigi Mangione in 2024, a case that gained national attention as a key example of how technology can be easily abused.
However, many remain skeptical about the practical application of the legislation, which could be easier to pass than implement, due to a combination of legal challenges, industry resistance and courts that have historically treated 3D gun files as a First Amendment right.
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