California lawmakers have handed Meeting Invoice 2047 out of the Meeting, advancing the amended proposal to the Senate for additional consideration.
Launched by Meeting Member Rebecca Bauer-Kahan, AB 2047 would add the California Firearm Printing Prevention Act as Title 21.1 to the state’s Civil Code. The invoice was amended within the Meeting on Might 18, 2026, and ordered to 3rd studying on Might 19, in keeping with California Legislative Data.
The proposal would require the California Division of Justice, or one other related state company, to research recognized firearm blueprint recordsdata and current detection algorithms. By January 1, 2028, the company would publish efficiency requirements for firearm blueprint detection algorithms and software program management processes meant to be used by 3D printer producers.
AB 2047 defines “firearm blocking know-how” as {hardware}, firmware, or different built-in technical measures that stop a 3D printer from beginning a print job except the underlying file has been evaluated by a firearm blueprint detection algorithm. The algorithm would want to evaluate STL recordsdata, CAD recordsdata, or geometric code, which may embrace machine directions used to regulate a print job, and flag recordsdata that could possibly be used to supply a firearm or unlawful firearm elements.
The invoice advances an earlier California 3D printer gun management proposal centered on requiring printers offered within the state to display screen recordsdata earlier than printing. The amended textual content provides that framework extra element, together with deadlines for efficiency requirements, producer attestations, state mannequin lists, and enforcement from March 2029.
Beneath the present textual content, producers producing 3D printers on the market or switch in California would want to submit an attestation kind for every make and mannequin by July 1, 2028. These attestations would affirm that the printer mannequin features a firearm blueprint detection algorithm, a software program controls course of, and testing of that system in opposition to state-issued efficiency requirements. Submitting a false attestation may result in perjury prosecution.
By September 1, 2028, the Division of Justice would publish a listing figuring out printer makes and fashions with full attestations, in addition to fashions with incomplete attestations on file. From March 1, 2029, the invoice would prohibit the sale or switch of 3D printers in California except they’re geared up with firearm blocking know-how and listed by the state as having an entire attestation on file.
Printer structure and open-source considerations
The invoice may have implications past firearm regulation as a result of it addresses how 3D printers obtain and course of recordsdata. AB 2047 lists firmware-based designs, built-in pre-print software program designs, and different approaches corresponding to handshake authentication as potential routes for implementing a software program management course of.
For built-in pre-print software program, the invoice describes a system the place a 3D printer accepts geometric code solely from a single slicer or pre-print software program, which often is the producer’s proprietary software program. That software program would consider STL or CAD recordsdata earlier than producing printable code and would refuse to generate code for recordsdata recognized as firearms or unlawful firearm elements.
These provisions may have an effect on open-source and third-party 3D printing workflows as a result of the invoice permits compliance by way of firmware-based controls, built-in pre-print software program, or different techniques designed to stop customers from bypassing file screening.
The invoice builds on current California regulation that already criminalizes knowingly aiding or facilitating the illegal manufacture of firearms, together with firearms made utilizing a 3D printer.
Screening necessities increase technical questions
File-screening techniques face the problem of distinguishing firearm elements from reputable mechanical elements. Related firearm screening necessities for 3D printers have already raised feasibility questions, notably as a result of mechanical elements can resemble each other throughout completely different purposes. A element utilized in a firearm could share geometric options with a hinge, instrument housing, or different benign half, making intent troublesome to deduce from form alone.
File-matching techniques additionally face limits. Small adjustments to a mannequin can alter its digital signature with out altering the perform of the 3D printed half, whereas extra superior file evaluation could require computational sources past these out there on many client 3D printers. Transferring these checks to distant servers may introduce privateness, connectivity, and database-maintenance questions for customers and producers.
These considerations overlap with wider open-source 3D printing considerations round firearm screening payments. Adafruit has warned that compliance tied to proprietary software program, cloud verification, or centralized authentication may have an effect on training, offline 3D printing, small producers, and open-source firmware tasks.
Enforcement and penalties
Violations may set off civil actions. An individual who sells or transfers a non-compliant printer, or knowingly recordsdata a false attestation, may face a civil penalty of as much as $25,000 per violation, plus injunctive reduction and legal professional’s charges for prevailing plaintiffs.
The invoice additionally creates a brand new crime. Knowingly disabling, deactivating, uninstalling, or in any other case circumventing firearm blocking know-how with intent to fabricate firearms could be a misdemeanor. The identical would apply to knowingly distributing modified printers to facilitate illegal firearm manufacturing.
AB 2047 states that efficiency requirements ought to account for false-positive and false-negative charges, and doesn’t require an ideal detection charge. It additionally calls for normal updates as new firearm blueprint recordsdata emerge.
A number of classes of printers could be exempt, together with techniques manufactured and offered completely to licensed firearms producers, the State of California, regulation enforcement businesses, sure engineering corporations and authorities contractors, and leisure business stagecraft or propmaking studios. The listed exemptions don’t seem to cowl common consumer-grade printers utilized in settings corresponding to colleges, libraries, or makerspaces.
From file moderation to printer controls
Different elements of the 3D printed firearms chain have additionally confronted scrutiny. After a New York investigation discovered downloadable weapon design recordsdata on Thingiverse, the platform ramped up efforts to limit entry to firearm blueprints and later deployed automated instruments to detect and take away such content material.
Different technical responses deal with enforcement after manufacturing. Analysis into easy methods to hint 3D printed ghost weapons has explored chemical profiling of 3D printing polymers, reflecting the issue of making use of standard firearms evaluation to printed weapons.
3D Printing Business is inviting audio system for its 2026 Additive Manufacturing Purposes (AMA) collection, overlaying Power, Healthcare, Automotive and Mobility, Aerospace, Area and Protection, and Software program. Every on-line occasion focuses on actual manufacturing deployments, qualification, and provide chain integration. Practitioners involved in contributing can full the decision for audio system kind right here.
To remain updated with the newest 3D printing information, don’t neglect to subscribe to the 3D Printing Business e-newsletter or comply with us on LinkedIn.
Discover the total Way forward for 3D Printing and Government Survey collection from 3D Printing Business, that includes views from CEOs, engineers, and business leaders on the industrialization of additive manufacturing, 3D printing business traits 2026, qualification, provide chains, and additive manufacturing business evaluation.
Characteristic picture reveals 3D printed golden gun design by Brian Moman, aka VariablePenguin. Picture through Thingiverse
