(Credit: Jeffrey Hazelwood/PCMag; Getty Images)
Washington State in March quietly crossed a line that may seem small on paper but feels significant to me—a longtime member of the 3D-printing community—in practice. With the passage and signing of House Bill 2320, the state didn’t just target untraceable firearms. It reached upstream into the ecosystem that makes them possible, regulating digital firearm files, restricting their distribution, and explicitly pulling 3D printers and CNC machines into the legal framework.
California has already moved in a similar direction with AB 1263, which expands liability for those who facilitate or distribute digital firearm manufacturing code, and with the proposed AB 2047, which would require 3D printers sold in the state to include blocking technology capable of detecting and preventing the production of firearm components. Colorado’s HB26-1144, on its way to the governor for his signature, takes a more direct route, criminalizing the manufacture of certain firearms and parts using 3D printing.
(Credit: Michael Lydick)Meanwhile, in both California and New York, lawmakers are exploring proposals that would require printers themselves to recognize and refuse to produce weapons components. If these bills pass, uploaded parts files will be reviewed by AI programs, with an additional layer of human intervention.
Ghost guns, which are unserialized weapons, are difficult to trace, increasingly accessible, and growing in number. But the methods being deployed to stop them raise a broader question that extends well beyond firearms: When a general-purpose tool like a 3D printer is asked to decide what it is allowed to make, where does regulation end and state control begin? Lawmakers are no longer just regulating finished products, but the inputs and processes that create them.
From my vantage point, state governments don't just want to ban ghost guns. They want to control your 3D printer. This should alarm advocates of both the First and Second Amendments.
Legislation Attempts to Close a 'Digital Loophole'
Part of the urgency behind these laws can be traced to federal analysis during the Biden administration, a study commissioned by executive order in 2024 when agencies increasingly grouped 3D-printed firearms into that broader category of ghost guns. According to federal data, law enforcement recovered roughly 1,600 ghost guns in 2017, a number that climbed to more than 27,000 annually by the early 2020s. Those figures helped drive new federal rules and policy attention, and they do reflect a real trend: 3D-printed weapons, along with kit-built firearms, are becoming more accessible and more common.
Advocates for these bills are on the literal front lines of gun violence in their communities and are fearful of what they believe the widening use of 3D printers means in their own localities. Monisha Henley, senior vice president for government affairs at Everytown for Gun Safety, testified that HB2320 would close a dangerous “digital loophole” with regard to 3D printers used to manufacture guns.
(Credit: GitHub/Michael Lydick)I wanted to see for myself how easy it was to use a consumer-grade printer, to ascertain if that fear was justified. Recently, I easily downloaded the files and printed the parts needed to create a single-shot pistol in 17 hours. The only non-3D-printed materials it needs are a small roofing nail that acts as a firing pin and the ammunition, which is available at any Walmart. There isn’t much expertise involved. The files were free for the taking on a file-sharing site, listed in order, with the required quantities of each part specified in the file description.
GitHub has already deployed AI-scanning software across its platform, and analysts agree it wouldn’t be hard for the site to quickly remove contested weapons files if required. This raises an important question, however. As the files are G-code—recipes that printers and CNC machines follow to make these parts—couldn’t members of the file-sharing community slightly alter the code (a few ones and zeroes here and there) and reupload them to escape purges? If so, it’s hard to see how gun files, or any files or information deemed “unsafe,” could be suppressed in any meaningful way.
3D-Printed Guns Are Still a Tiny Fraction of Overall Firearms
It reminds me of how DuPont altered its Teflon formula after a groundbreaking lawsuit exposed the health risks of the chemical components in the infamous coating. DuPont stopped using the toxic long-chain PFOA in its formula, replacing it with "GenX," a shorter-chain alternative with a slightly different structure, which is arguably as toxic and less safe than the original formulation.
The nearly indistinguishable differences in the molecular code made it an entirely different chemical in the eyes of regulators and litigators, not subject to the prior lawsuit, and allowed the company to continue manufacturing and selling the non-stick coating. It’s not hard to see how people intent on keeping gun files, or any information the government wants restricted, could use similar techniques electronically.
That said, it’s the scale of the trend that matters in my opinion. Across the same period of time as the aforementioned Biden administration study, law enforcement agencies in the US have recovered firearms in the hundreds of thousands, with the overwhelming majority of those weapons being traditionally manufactured. Even using the higher-end estimates, ghost guns only account for a single-digit percentage of recovered firearms annually, with fully 3D-printed weapons representing an even smaller fraction.
That contrast doesn't invalidate the concern. It reframes it. Ghost guns are growing quickly, but they are still a tiny niche within a much larger and deeply entrenched ecosystem of conventional firearms. The policy response, however, is not confined to that niche. In several cases, it extends beyond the weapons themselves to the digital files, software platforms, and even the machines capable of producing them, which has a lot of people, including me, wondering if this isn’t about something much larger.
Could this legislative expansion be more about the infrastructure of additive manufacturing itself?
Casting a Wide Net Beyond the Finished Product
What makes the current wave of legislation different is the wide net it casts beyond the finished product, upstream into the information, websites, and tools used to make things today. Washington’s ESHB2320 and California’s AB 1263 are not just about the weapon. They are about the pipeline that creates it, from files to platforms to machines. From an enforcement standpoint, that progression is logical. If you can’t reliably stop the finished product, you move upstream to its source. But additive manufacturing complicates that strategy, because the same pipeline that produces a firearm component also produces everything else.
That “everything else” is not hypothetical. In medicine, additive manufacturing enables the fabrication of patient-specific implants with complex lattice structures that promote bone growth. In aerospace, components like the GE LEAP fuel nozzle consolidate dozens of parts into a single unit, reducing weight while improving durability and performance. At the consumer level, desktop printers have turned garages and small workshops into rapid prototyping labs, where individuals can iterate on ideas at speeds and costs that once required industrial infrastructure. All of this depends on a simple premise: The printer doesn’t care what it is making. The moment that changes, the innovations and resulting technology change with it.
California’s proposed AB 2047 would require printers to actively scan and block certain designs. New York policymakers have pointed to AI-driven detection tools as a model for enforcing compliance at the hardware level. These systems are often described as safeguards, and in controlled environments, they can be effective. But scaling them into consumer hardware introduces a different dynamic. A printer that evaluates every file before printing is no longer just executing instructions. It’s enforcing rules. It’s introducing barriers to innovation and manufacturing and throttling the speed of product development.
There is also a practical question of how effective these rules are in geographically fragmented systems, where printers with two different firmware flashes could be a mile apart on opposite sides of a state line. The US already provides a clear analog. Cities with strict gun laws, such as Chicago, have long struggled with the flow of firearms from neighboring states with more permissive regulations. Enforcement doesn’t stop at jurisdictional boundaries, but behavior often adapts to them. Will 3D printer companies need to have a “California” machine and an “Arizona” variant?
I worry that the oversized response signals that something more nefarious is emerging, with down-the-road implications that people in additive manufacturing communities have been discussing.
There is a historical echo here, even if the comparison is not exact. After the 9/11 attacks, the USA PATRIOT Act rapidly and broadly expanded the federal government’s surveillance capabilities. Over time, however, those tools became part of a broader, unaccountable framework, as revealed in part by Edward Snowden's disclosures about bodies like the National Security Agency, which showed how large-scale monitoring could extend to unauthorized domestic communications.
The lesson is not that history is repeating itself. It is that systems designed to address narrow and infrequent risks can and often do evolve into broader mechanisms. As proposals begin to focus on scanning files, monitoring print jobs, and embedding controls into the machines themselves, they raise a new possibility: that oversight could move from the digital conversations we have to the physical objects we attempt to create, placing elements of design and fabrication under a level of scrutiny that has traditionally been reserved for information, not invention.
Is Regulation Addressing Risk or Reasserting Control?
There’s also the question of incentives. The US government is investing heavily in additive manufacturing, particularly through the Department of Defense, which sees it as a strategic advantage for logistics and production. At the same time, it has restricted the use of certain foreign-made technologies in sensitive environments, echoing earlier moves to limit overseas platforms like China-based DJI drones and foreign routers. These policies are grounded in national security concerns, but they also highlight a tension. Additive manufacturing is being promoted as a critical capability at the institutional level, while new regulations explore how to throttle and constrain its use at the consumer edge.
As additive manufacturing becomes more important, the systems surrounding it may naturally evolve toward models that are easier to monitor and regulate. If only one legacy manufacturer can produce a $20,000 tool, but a million individuals can suddenly replicate it with a 3D printer, restricting that capability raises an uncomfortable question: Is the regulation addressing risk or reasserting control over who gets to manufacture? If one million people can make aerospace- grade spare parts, what happens to time-honored, bloated billion-dollar budgets and their pork protectors?
The debate around ghost guns often centers on whether regulation is necessary. It’s already illegal in California, Washington, and New York to possess one. The harder question now is how far upstream the regulations should go and what happens when it reaches the point where machines themselves, and the computers that hold files, become arbiters of intent. Because at that point, a 3D printer is no longer just a tool. It’s a participant.
The 3D-printing culture has always been defined by its openness. I believe it democratizes innovation and manufacturing and restores balance to individuals and small businesses. This wave of legislation is testing whether openness can coexist with efforts to prevent misuse before it spreads beyond control. The outcome will not just determine how we regulate ghost guns. It will determine whether one of the most flexible manufacturing technologies ever created remains open-ended and flourishes, or becomes something that only works within the boundaries it is told to recognize.