California wants software in every 3D printer that scans everything you make, blocks what it flags, and makes switching it off a crime if the state says you meant to make a gun. It won't stop a determined criminal. It will surveil millions.
3D printing is a tool for millions of people. Treating it like a weapon punishes every one of us. Tap any name to see how it affects them.
From the workshop to the kitchen table, it reaches almost every home and every hobby.
Untraceable homemade guns are on the rise, and that is worth taking seriously. But blaming the 3D printer confuses the tool with the crime.
Homemade, unserialized guns are turning up more often, including machine-gun switches and firearms built by teenagers. It is a genuine problem. Their answer is to put a filter inside every 3D printer and treat the machine as the culprit.
Making these guns is already illegal. Determined offenders use CNC machines, kits bought off the shelf, and metal parts a print filter never sees. The 3D printer is a general purpose tool used by millions to heal, teach, and build. The real problem is criminal misuse and enforcement, not the technology.
Almost all ghost guns are metal and polymer kits like Polymer80 and 80% frames, which a printer filter cannot touch. Where printed guns are climbing fastest, in strict-law cities like New York, it is because a 2022 crackdown on kits pushed demand to printing. Restrict one method and crime just moves to the next.
AB 2047 filters every printer
to chase under 1% of the problem.
We are not here to defend crime. Untraceable homemade guns are a real problem and we take it seriously. This bill just will not fix it, and it breaks something the whole world depends on.
Fewer untraceable weapons.
Full stop.
Change the design even slightly and it prints anyway. The bill's own authors stopped claiming it stops a skilled user.
It surveils every print and blocks our future in medicine, education, and engineering, worldwide.
Enforce the laws we already have. Target the crime, not the tool.
Go after traffickers and machine gun switches, not the tools we all use.
Every print must first be cleared by a firearm-detection algorithm that no printer you can buy runs today, and that will not work.
The computers inside consumer printers are far too small to analyze a model, so the check gets pushed to the cloud, watching everything you make. And the EFF's engineers document that a trivial file edit defeats it in seconds. A barrel can be a tube, a grip can be a handle. You cannot read intent from a shape.
Anything the algorithm decides is a gun part is refused. By the bill's own text, false positives are expected.
In plain terms: your printer will refuse ordinary, harmless objects, a bracket, a pipe fitting, a toy, a prosthetic socket, an optical mount, because they happen to share a shape with a gun part. The law itself says this will happen, and there is no appeal for a print your machine simply will not run.
Switching the filter off becomes a misdemeanor if the state says you meant to make a gun, and open-source firmware is caught in the net.
Most printers on Earth run free, community-built software like Marlin, Klipper, and RepRap that anyone can read and improve. The bill would force that open, editable software to carry government censorware, and stripping it out invites a criminal charge that turns on what a prosecutor believes you intended. Open source code you edit at your own legal risk is not open. It effectively outlaws the firmware the whole hobby is built on.
From 2029, it is illegal to sell or transfer any 3D printer in California that is not on the state's approved list, up to $25,000 a printer. Because the required filter does not exist, every printer sold today would be pulled from the shelves.
You would not be a criminal for owning the printer you already have. But you could no longer buy a new one, the definition is broad enough to cover essentially every additive machine, and reselling or replacing a printer, or running a print farm, becomes a legal minefield. No manufacturer builds a California-only printer, so what California bans, the world stops making.
Every point above is drawn from the bill text. The installed-base figure is an estimate from US Census household data and CONTEXT market reports (over a million printers ship worldwide each quarter).
The right to learn, repair, prototype, and build our future.
The right to make without surveillance, to own the machine you paid for, to run the software you choose, and to buy a printer at all.
The law itself allows the filter to block harmless, everyday objects and to miss real guns. Getting it wrong is built in.
So a perfectly legal part could be blocked for good, and there is no way to know which ones in advance. You find out when your machine refuses to run.
Partway through, the bill's own writers quietly lowered the goal from stopping a skilled user to just making it a little harder.
Which is really a quiet admission: even the people who wrote it have stopped claiming it works.
Per printer sold that is not on the state's approved list. It lands on the sellers, from big retailers to the maker reselling one machine.
And what about three million plus printers already out there? A 3D printer can build another one, which can then print anything at all.
Consumer printers cannot do this locally, so it moves to the cloud, turning every print into something a vendor can see.
So no printer works without internet, exactly when it matters most: in a disaster, when the power is down and a printed part could save a life.
A printer cannot judge what you are making, so the only way to enforce this law is to inspect every design you ever print.
That is not a safety feature. It is a search of everything you create, running before you are suspected of anything.
There is no finished list of banned designs; the bill orders one that updates forever. A censorship list that only ever grows.
Once the state can tell your tools what they may not make, the question is never whether the list grows, only what gets added next.
The bill bans selling printers without blocking technology defined by state standards nobody has written. The state gives itself until September 2028 to write them.
Manufacturers must then swear compliance by March 2029, for detection software experts say cannot reliably work. A mandate before compliance even has a meaning.
The bill creates a new crime for local police and courts to handle and, in its own Section 4, promises them nothing to pay for it.
And none of it ever ends: no sunset clause, no review, no off switch if it fails. A permanent program for a broken idea.
Sources: the EFF's technical analyses ( why print blocking cannot work and the dangers of AB 2047), the Senate's own Judiciary Committee analysis, and the bill text itself (deadlines: Sections 3273.633 to 3273.636; reimbursement: Section 4).
The same machines that could, in theory, print a gun part are printing hands for children, hearing aids, classroom projects, and the parts that keep small businesses alive.
A rifled barrel is a grooved cylinder. So are screws, optical mounts, and a thousand everyday parts. You cannot tell a gun from a tube by its shape.
A law that stops almost no crime still creates winners. Follow the incentives.
The bill names no company. It mandates a detection algorithm and lets the state certify whichever it likes, handing that vendor a captive market: every printer sold in California, then everywhere. The sponsor's whole case is that "the technology already exists". The firms selling it, like Print&Go and Create It REAL, are the ones who cash in.
The bill was written and pushed by Everytown for Gun Safety, the group founded and primarily funded by billionaire Michael Bloomberg. It is model legislation Everytown is running state by state, a political win it can copy and paste.
Dominant manufacturers get legal cover to lock down your machine, push cloud subscriptions, and outlaw the open-source rivals that keep printers cheap. EFF calls the bill "a gift for the biggest 3D printer manufacturers."
Everyone else. Makers, students, teachers, small businesses, and hospitals lose a tool they depend on.
Open-source volunteers are criminalized for sharing a file.
And taxpayers foot the bill, all to block under 1% of the problem while gutting multi-billion dollar industries the world depends on, for a system that is unproven, does not yet exist, and cannot work.
You pay for it. It doesn't work.
They profit.
No manufacturer builds a printer just for California. To sell there, they ship the same locked-down machine everywhere, so a state law becomes a global standard, the way California emissions and privacy rules already have. It reaches you wherever you are, and wherever you are, you can push back.
Not in the US? Want to do more? Now is the time to amplify: make a video, bring your company on board, spread the word.
Now is the time to make noise and stand up for the right to make.
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