California AB-2047: New Bill Would Restrict 3D Printer Sales to DOJ-Approved Models

What Is AB-2047?

On February 17, 2026, California Assemblymember Rebecca Bauer-Kahan introduced AB-2047, the California Firearm Printing Prevention Act. If passed, it would become one of the most restrictive 3D printing regulations in the United States, requiring all 3D printers sold in California to include state-approved "firearm blueprint detection" software.

The bill aims to curb the production of untraceable "ghost guns" by mandating that printers actively scan and block files that resemble firearm components. But the implications go far beyond gun control — this could reshape the entire 3D printing market in California.

What the Bill Requires

Starting March 1, 2029, AB-2047 would make it unlawful to:

• Sell or offer to sell a 3D printer in California that lacks certified "firearm blocking technology"
• Sell any 3D printer not listed on a DOJ-maintained roster of compliant models
• Knowingly disable or circumvent the blocking software (misdemeanor offense)

The bill requires the California Department of Justice to:

• Investigate existing firearm blueprint detection algorithms by July 2027
• Publish performance standards for detection software certification
• Begin certifying algorithms by January 2028
• Maintain a public roster of compliant 3D printer models

How Would Detection Work?

The proposed "firearm blueprint detection algorithms" would scan 3D model files before printing and block those that match known firearm component patterns. Theoretically, this would prevent users from printing lower receivers, frames, barrels, and other regulated parts.

However, experts and community members have raised significant concerns:

• False positives: Many benign objects resemble firearm parts — a tripod leg with internal threads could look like a gun barrel, a grip for a caulking gun could match a pistol grip pattern
• Cosplay and props: Film prop reproductions, costume accessories, and decorative items could trigger blocks
• Open source firmware: Many popular printers use open source firmware that can be modified, making restrictions trivially bypassable
• Technical feasibility: Detecting intent from geometry alone is extremely difficult

Community Reaction

The 3D printing community has responded with concern. A Reddit thread on r/3Dprinting titled "Stop the 3D Printing Ban" has garnered over 250 upvotes, with users discussing the broader implications for makers, small businesses, and open source development.

Adafruit, a major DIY electronics retailer, published criticism noting that the bill creates a "state-maintained roster of approved makes and models" — potentially favouring large manufacturers over smaller companies and open source projects.

California Is Not Alone

AB-2047 follows similar legislative efforts in other states:

• Washington State: Has introduced comparable legislation targeting 3D printed firearms
• New York: Also pursuing legal measures to restrict untraceable gun manufacturing

California is the world"s 4th largest economy. Regulations adopted here often influence other states and even international markets.

What This Means for Makers

If you live in California and are considering purchasing a 3D printer:

• Current printers: The bill would not make existing printers illegal to own — only new sales would be restricted
• Future purchases: From 2029, only DOJ-approved models could be sold in California
• Open source concerns: Printers with closed, certified firmware may be the only legal options
• Used market: The bill applies to "transfers for consideration", potentially affecting private sales

What Happens Next?

The bill is currently in the early legislative process:

• February 17, 2026: Bill introduced
• March 20, 2026: Earliest date it can be heard in committee
• July 2027: DOJ guidance on detection standards (if passed)
• January 2028: Algorithm certification begins (if passed)
• March 1, 2029: Restrictions take effect (if passed)

The bill must pass through committee review, both houses of the legislature, and receive the governor"s signature before becoming law.

The Bottom Line

AB-2047 represents a significant shift in how governments approach 3D printing regulation. While the stated goal of preventing illegal firearm production is clear, the technical implementation raises serious questions about effectiveness, privacy, and the impact on the broader maker community.

California residents who want to voice their opinion can contact their state representatives. The bill is scheduled for committee review starting March 20, 2026.