3D Printing and CNC Manufacturing Laws: Research Digest

Date saved: 2026-10-26 18:01 (PDT)

Sources: Tom's Hardware, Yahoo News, California Senate, Planet 3DP, Congress.gov, Fabbaloo, TechRadar, Newsweek

Key findings

California AB 2047: the new firearm-blocking requirement

Tom's Hardware / Jowi Morales (October 2, 2026): California Governor Gavin Newsom signed a bill requiring 3D printer manufacturers to include firearm-blocking technology in their products once an industry standard is published by ASTM International, making California the second state to enact firearm restrictions on 3D printers following New York; the law only affects 3D printers that have yet to be sold, so existing 3D printers do not need to be retrofitted; it regulates the sale and transfer of 3D printers, not their ownership or use; the law mandates the California DOJ to check for an ASTM standard quarterly, starting no later than July 1, 2027, until July 1, 2029; if no standard is published by then, the DOJ is no longer required to check for one, meaning the process to write the guidelines manufacturers need to follow to sell 3D printers in California might not even begin; two primary detection methods exist - matching against a known database of gun files or analyzing by a trained model - but both have shortcomings: the database approach can be defeated by modifying the file, and the model approach is prone to false positives that could prevent printing of legitimate parts like barrels, brackets, levers, and tubes. (Source)

California Senate Committee on Public Safety (AB 2047 analysis): The bill makes it unlawful to sell or transfer a 3D printer in California that is not equipped with firearm blocking technology or not listed on the DOJ's list of 3D printers for which the manufacturer has submitted a complete attestation; the law defines "firearm manufacturing machine" to include a 3D printer, a CNC milling machine, or a similar machine marketed or sold, or reasonably designed or intended to be used, to manufacture or produce firearms; the application of firearm-blocking technology will only be required once ASTM International publishes or adopts a standard for firearm-blocking technology for 3D printers; the law does not apply to existing printers. (Source)

The state law patchwork: Washington, Colorado, New York

Planet 3DP (October 2026): Washington's HB 2320 has been in effect since March 24, 2026, barring the making of frames or receivers on a 3D printer or CNC mill unless you are a federally licensed manufacturer, and restricting the sharing of gun files; Colorado's HB 26-1144 took effect July 1, 2026, banning the printing or milling of guns and certain gun parts without a federal license; the Colorado law defines "3D printing" to include CNC milling (subtractive) and only matters when you are making a functional firearm, an unfinished frame or receiver, a large-capacity magazine, or a rapid-fire device; New York's new 3D printing crimes took effect August 25, 2026 - sharing gun files with unlicensed people is a misdemeanor, and making a ghost gun is a felony; the printer-blocking rule is not in effect in New York; federally, the 3D Printed Gun Safety Act has not moved since June 2025. (Source)

Congress.gov (S.2165, 119th Congress): The 3D Printed Gun Safety Act of 2025 would amend chapter 44 of title 18, United States Code, to prohibit the distribution of 3D printer plans for the printing of firearms; it would make it unlawful for any person to intentionally distribute, over the internet or by means of the World Wide Web, digital instructions in the form of Computer Aided Design files or other code that can automatically program a 3D printer or similar device to produce a firearm or complete a firearm from an unfinished frame or receiver. (Source)

California sues Polymaker over filament marketing

Tom's Hardware / Denise Bertacchi (October 11, 2026): The state of California sued 3D printer filament company Polymaker for promoting ghost guns by marketing to the 3D-printed gun community; the newly formed Consumer Fairness and Public Protection Division is also targeting Roblox and AppLovin; San Diego County sued Polymaker on October 5, 2026, arguing its marketing to the 3D-printed gun community turns PLA filament into a regulated "firearm precursor part." (Source)

Nozzle4 (October 25, 2026): San Diego County sued Polymaker on October 5, 2026, arguing its marketing to the 3D-printed gun community turns PLA filament into a regulated "firearm precursor part"; the lawsuit argues the filament company's marketing crosses the line from selling a printing material into selling the means to produce untraceable firearms. (Source)

The ghost gun landscape: CNC, lathes, and digital manufacturing

Tom's Hardware / Stephen Warwick (October 16, 2026): A gun rights activist unveiled the world's first "AI-made" 3D-printed firearm - a .22 caliber handgun created by an "AI that can generate guns" called GatGPT; the weapon can be manufactured using 3D printers or personal steel mills and lacks traceable serial numbers; a U.S. judge temporarily blocked the online publication of blueprints for 3D-printed firearms in a last-ditch effort to stop a settlement the Trump administration had reached with the company releasing the digital documents; White House spokesman Hogan Gidley said "It is currently illegal to own or make a wholly plastic gun of any kind - including those made on a 3D printer." (Source)

Policing Institute (2026): Ghost guns primarily take two forms: 3D-printed firearms and commercially produced components and kits that require some machining to become a functional firearm; the unregulated market of commercially produced ghost gun kits and components is a far more salient concern for public safety than 3D-printed firearms, which still have technical challenges that have not been fully addressed with consumer-grade 3D printers; jurisdiction over CAD files that facilitate the production of firearms has moved from the Department of State to the Commerce Department, and the distribution of such files remains unclear; the overwhelming majority of ghost gun recoveries have been from commercially produced components and kits, not 3D-printed guns. (Source)

Russia's 3D-printed cruise missiles in Ukraine

Tom's Hardware / Jowi Morales (October 24, 2026): Russia deploys 3D-printed cruise missiles with U.S. electronics in Ukraine, capable of hitting 500mph with a 745-mile range; the missiles use additive manufacturing for components and incorporate U.S.- Origin electronics, highlighting how digital manufacturing has become a significant factor in the war. (Source)

California became the second state to enact firearm restrictions on 3D printers when Governor Gavin Newsom signed AB 2047 on September 26, 2026, requiring 3D printer manufacturers to include firearm-blocking technology in their products once ASTM International publishes a standard. The law only affects printers that have yet to be sold - existing 3D printers do not need to be retrofitted - and it regulates the sale and transfer of 3D printers, not their ownership or use. But the mandate only triggers once a standard exists, and the California Department of Justice must check for one quarterly starting no later than July 1, 2027, through July 1, 2029; if no standard is published by then, the process for manufacturers to comply may never begin.

The California law sits inside a growing patchwork. Washington's HB 2320 has been in effect since March 24, 2026, barring the making of frames or receivers on a 3D printer or CNC mill without a federal license and restricting the sharing of gun files. Colorado's HB 26-1144 took effect July 1, 2026, banning the printing or milling of guns and certain gun parts without a federal license. New York's new 3D printing crimes took effect August 25, 2026, making the sharing of gun files with unlicensed people a misdemeanor and making a ghost gun a felony. California's law, by contrast, contains no printer roster and no crime for modifying your own machine. Two other states - Colorado and Washington - also have similar bills that would require "blocking features" moving through state legislatures. Federally, the 3D Printed Gun Safety Act has not moved since June 2025.

What to watch next: whether ASTM International ever publishes the standard California's law depends on, whether the 3D Printed Gun Safety Act gains traction in the 119th Congress, whether the California DOJ's quarterly checks begin on schedule in July 2027, and whether Polymaker's lawsuit - in which San Diego County and the state of California argue that marketing filament to the 3D-printed gun community turns PLA filament into a regulated "firearm precursor part" - produces a precedent that reaches beyond filament to the printers themselves.