3D Printing & CNC Manufacturing Laws, Research Digest

Date saved: 2026-10-22 03:00 (PDT)

Sources: Giffords, Colorado Legislature, California Senate, PCMag, The Register, Adafruit, EFF, New York Senate, Washington State Legislature

Key findings

Colorado: 3D printing defined to include CNC, felony for second offense

Giffords (2026): Colorado (HB 1144) prohibited manufacturing a firearm, unfinished frame or receiver, large-capacity magazine, or rapid-fire device with a 3D printer or CNC milling machine without a federal firearms license. New Jersey previously banned 3D printing firearms without a license and also prohibited possession of the digital code used to 3D print firearms with intent to manufacture one (AB 4975). New York (S.9005) became the first state to require that all 3D printers for sale come with blocking technology to prevent the printer's use to manufacture firearms and conversion devices, requirement goes into effect as soon as technologically feasible. Washington lawmakers banned not only 3D printing of firearms but also distribution of digital firearm manufacturing code (HB 2320). California is considering AB 2047 requiring blocking technology on 3D printers akin to New York's law. (Source)
Colorado Legislature (HB26-1144): The act defines 3-dimensional printing to mean additive and subtractive manufacturing. It prohibits knowingly manufacturing or producing a potentially functioning firearm, unfinished frame or receiver, large-capacity magazine, or rapid-fire device by 3-dimensional printing. Unlawful 3-dimensional printing of a firearm or firearm component is a class 1 misdemeanor; a second or subsequent offense is a class 5 felony. The act also criminalizes possessing or distributing digital instructions if "circumstances indicate intent" to manufacture or distribute unlawfully. Effective July 1, 2026. (Source)
Planet 3DP (May 7, 2026): Colorado's law has a definition problem most people aren't talking about, it defines 3D printing as both additive AND subtractive manufacturing. That means CNC machines, milling equipment, and router tables are legally 3D printers under Colorado law. Woodworkers, machinists, and engineers who have nothing to do with firearms just got pulled into a ghost gun manufacturing statute. Governor Jared Polis signed HB 26-1144 on May 5, 2026, effective July 1. (Source)

New York: blocking technology mandate and digital firearm manufacturing code felony

PCMag / Adafruit (2026): New York's FY 2026-2027 executive budget bill (S.9005 / A.10005) requires all 3D printers sold or delivered in New York to include "blocking technology," defined as software or firmware that scans every print file through a "firearms blueprint detection algorithm" and refuses to print anything it flags as a potential firearm or firearm component. The requirement would cover a broad set of manufacturing machinery, not just SLA and FDM additive printers, but also CNC mills and "any machine capable of making three-dimensional modifications to an object from a digital design file using subtractive manufacturing." The law criminalizes the intentional sale, distribution, or possession of digital instructions to illegally manufacture a firearm or component parts without a license. (Source)
Quality Rot (Jun 23, 2026): New York's law creates a new category in its penal code called "digital firearm manufacturing code" covering computer aided design files or other code that can program a 3D printer or a CNC mill to produce a firearm or a major component. Distributing that code to an unlicensed person becomes a felony. The law defines blocking technology as hardware, software, firmware integrated measures that make a printer refuse to print a file unless evaluated by a blueprint detection algorithm and determine that this thing isn't a firearm or an illegal firearm part. Adafruit found the language covered not just additive printers, but CNC mills, and any machine capable of making 3D modifications to an object from a digital file using subtractive manufacturing. (Source)
New York Senate (S.9005): The law requires a state task force to first recommend firearm prevention technology requirements for 3D printers before the blocking mandate takes effect. In-person-only printer sales are also required. (Source)

California, Washington, New Jersey, Delaware: the expanding patchwork

California Senate (AB 2047): 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. Requires the DOJ to publish guidance on performance standards for firearm blueprint detection algorithms and software control processes. Commencing December 1, 2029, any business that produces or manufactures 3D printers for sale in California must equip each printer with firearm blocking technology and submit an attestation for each make and model. The bill passed the Assembly in May 2026. (Source)
The Register (Feb 5, 2026): State and federal lawmakers stepped up efforts to prevent the creation of 3D printed guns. Recent bills include New York's FY 2026-2027 executive budget bill, Washington State House Bills 2320 and 2321, and the 3D Printed Gun Safety Act introduced in the US House and Senate. Several states already have laws that disallow distribution of digital gun files: Delaware and New Jersey make it illegal to distribute any files within the state that can be used to program a 3D printer to make a firearm, while California creates a civil cause of action against these actors. (Source)
Washington State Legislature (HB 2320): Governor Bob Ferguson signed HB 2320 on March 24, 2026. It bans using 3D printers or CNC machines to manufacture firearms or components without a license and restricts sharing digital CAD files for firearm manufacturing with anyone unlicensed. It is already in effect. (Source)

Technical feasibility and open-source firmware response

Quality Rot (Jun 23, 2026): At least 16 states have laws addressing 3D-printed firearms; 7 added major legislation in 2026 per Stateline. EFF, Adafruit, Firearms Policy Coalition, and engineers have said the blocking technology is technically infeasible. The blocking mandate reaches open-source firmware, CNC machines, online printer sales, and CAD file sharing across multiple states. (Source)
Synthtopia / M-VAVE (2026): M-VAVE has released FM1 Open, an official firmware and development project that adds an eight-track sequencer, multiple synthesis engines, sample playback and tools for developers to extend the FM-1, part of an emerging ecosystem of open solutions around the FM-1 where users can preview synths online, download them to cheap hardware or run them as plugins in a DAW. This open firmware ecosystem is the kind of community response that printer-level content mandates are likely to trigger. (Source)
Elektron Model:Cycles / Free firmware mod (2026): Model-TG is a free, open-source firmware mod for the Elektron Model:Cycles that adds a full Sampler machine and a variety of other features, the kind of community-built firmware alternative that becomes more relevant when devices face content-blocking mandates. (Source)

The 3D printing and CNC manufacturing law wave of 2026 is the most significant expansion of firearm-adjacent regulation since the ghost gun rules (and it reaches far beyond guns into the general-purpose manufacturing tools that makers, woodworkers, machinists, and engineers use every day. The critical legal innovation is that several states are now defining "3D printing" to include subtractive manufacturing (CNC milling), which means a CNC machine in a home workshop or a vocational school program can fall under the same statutory framework as a resin printer making gun parts. Colorado's HB26-1144, which took effect July 1, 2026, explicitly defines 3D printing as both additive and subtractive manufacturing) a definitional move that the bill's own summary acknowledges pulls CNC machines, milling equipment, and router tables into a ghost gun manufacturing statute.

The throughline connecting these laws is a shift from targeting finished firearms to targeting the entire production pipeline: the digital files (CAD/STL code), the machines that read them, and the firmware that can block them. New York's budget bill (S.9005) is the most aggressive: it requires all 3D printers sold or delivered in the state to include "blocking technology" (firmware that scans every print file through a firearms blueprint detection algorithm and refuses to print anything it flags) and the Adafruit analysis found the language reaches CNC mills and "any machine capable of making three-dimensional modifications to an object from a digital file using subtractive manufacturing." California's AB 2047 would require manufacturers to embed a DOJ-approved firearm blueprint detection algorithm in every printer sold in the state by July 2028, banning the sale of non-compliant printers. These are content-filter mandates for physical manufacturing tools, and they raise the same kind of feasibility and overbreadth questions that content filters for internet platforms do.

What to watch next: whether AB 2047 passes the California Senate and gets signed (it passed the Assembly in May 2026), whether the New York task force actually produces workable blocking-technology standards given the widespread technical skepticism from Adafruit, EFF, and the Firearms Policy Coalition, and whether the federal NDAA FY2026 and HR 4143 produce any national framework that preempts the state patchwork. The open-source firmware community's response (alternate firmwares for the M-VAVE FM-1, Arturia Microfreak, and Elektron devices) is a preview of how the maker community may respond to printer-level mandates.