This is the first post in a series on 3D print blocking, for the next entry check out Print Blocking Won't Work - Permission to Print Part 2

When legislators give companies an excuse to write untouchable code, it’s a disaster for everyone. This time, 3D printers are in the crosshairs across a growing number of states. Even if you’ve never used one, you’ve benefited from the open commons these devices have created—which is now under threat.

This isn’t the first time we’ve gone to bat for 3D printing. These devices come in many forms and can construct nearly any shape with a variety of materials. This has made them absolutely crucial for anything from life-saving medical equipment, to little Iron Man helmets for cats, to everyday repairs. For decades these devices have been a proven engine for innovation, while democratizing a sliver of manufacturing for hobbyists, artists, and researchers around the world.

For us all to continue benefiting from this grassroots creativity, we need to guard against the type of corporate centralization that has undermined so much of the promise of the digital era.  Unfortunately some state legislators are looking to repeat old mistakes by demanding printer vendors install an enshittification switch.

In the U.S, three states have recently proposed that commercial 3D-printer manufacturers must ensure their printers only work with their software, and are responsible for checking each print for forbidden shapes—for now, any shape vendors consider too gun-like. The 2D equivalent of these “print-blocking” algorithms would be demanding HP prevent you from printing any harmful messages or recipes. Worse still, some bills can introduce criminal penalties for anyone who bypasses this censorware, or for anyone simply reselling their old printer without these restrictions. 

If this sounds like Digital Rights Management (DRM) to you, you’ve been paying attention. This is exactly the sort of regulation that creates a headache and privacy risk for law-abiding users, is a gift for would-be monopolists, and can be totally bypassed by the lawbreakers actually being targeted by the proposals.

Ghosting Innovation

“Print blocking” is currently coming for an unpopular target: ghost guns. These are privately made firearms (PMFs) that are typically harder to trace and can bypass other gun regulations. Contrary to what the proposed regulations suggest, these guns are often not printed at home, but purchased online as mass-produced build-it-yourself kits and accessories.

Scaling production with consumer 3D printers  is expensive, error-prone, and relatively slow.  Successfully making a working firearm with just a printer still requires some technical know-how, even as 3D printers improve beyond some of these limitations. That said, many have concerns about unlicensed firearm production and sales. Which is exactly why these practices are already illegal in many states, including all of the states proposing print blocking. 

Mandating algorithmic print-blocking software on 3D printers and CNC machines is just wishful thinking. People illegally printing ghost guns and accessories today will have no qualms with undetectably breaking another law to bypass censoring algorithms. That’s if they even need to—the cat and mouse game of detecting gun-like prints might be doomed from the start, as we dive into in this companion post.

Meanwhile, the overwhelming majority of 3D-printer users do not print guns. Punishing innovators, researchers, and hobbyists because of a handful of outlaws is bad enough, but this proposal does it by also subjecting everyone to the anticompetitive and anticonsumer whims of device manufacturers.

Can’t make the DRM thing work

We’ve been railing against Digital Rights Management (DRM) since the DMCA made it a federal crime to bypass code restricting your use of copyrighted content. The DRM distinction has since been weaponized by manufacturers to gain greater leverage over their customers and enforce anti-competitive practices. 

The same enshittification playbook applies to algorithmic print blockers. 

Restricting devices to manufacturer-provided software is an old tactic from the DRM playbook, and is one that puts you in a precarious spot where you need to bend to the whims of the manufacturer.  Only Windows 11 supported? You need a new PC. Tools are cloud-based? You need a solid connection. The company shutters? You now own an expensive paperweight—which used to make paperweights.

It also means useful open source alternatives which fit your needs better than the main vendor’s tools are off the table. The 3D-printer community got a taste of this recently, as manufacturer Bambu Labs pushed out restrictive firmware updates complicating the use of open source software like OrcaSlicer. The community blowback forced some accommodations for these alternatives to remain viable. Under the worst of these laws, such accommodations, and other workarounds, would be outlawed with criminal penalties.

People are right to be worried about vendor lock-in, beyond needing the right tool for the job. Making you reliant on their service allows companies to gradually sour the deal. Sometimes this happens visibly, with rising subscription fees, new paywalls, or planned obsolescence. It can also be more covert, like collecting and selling more of your data, or cutting costs by neglecting security and bug fixes.

With expensive hardware on the line, they can get away with anything that won’t make you pay through the nose to switch brands.

Indirectly, this sort of print-blocking mandate is a gift to incumbent businesses making these printers. It raises the upfront and ongoing costs associated with smaller companies selling a 3D printer, including those producing new or specialized machines. The result is fewer and more generic options from a shrinking number of major incumbents for any customer not interested in building their own 3D printer.

Reaching the Melting Point

It’s already clear these bills will be bad for anyone who currently uses a 3D printer, and having alternative software criminalized is particularly devastating for open source contributors. These impacts to manufacturers and consumers culminate into a major blow to the entire ecosystem of innovation we have benefited from for decades. 

But this is just the beginning. 

Once the infrastructure for print blocking is in place, it can be broadened. This isn’t a block of a very specific and static design, like how some copiers block reproductions of currency. Banning a category of design based on its function is a moving target, requiring a constantly expanding blacklist. Nothing in this legislation restricts those updates to firearm-related designs. Rather, if we let proposals like this pass, we open the door to the database of forbidden shapes for other powerful interests.

Intellectual property is a clear expansion risk. This could look like Nintendo blocking a Pikachu toy, John Deere blocking a replacement part, or even patent trolls forcing the hand of hardware companies. Repressive regimes, here or abroad, could likewise block the printing of "extreme" and “obscene” symbols, or tools of resistance like popular anti-ICE community whistles. 

Finally, even the most sympathetic targets of algorithmic censorship will result in false positives—blocking 3D-printer users’ lawful expression. This is something proven again and again in online moderation. Whether by mistake or by design, a platform that has you locked in has little incentive to offer remedies to this censorship. And these new incentives for companies to surveil each print can also impose a substantial chilling effect on what the user chooses to create.

While 3D printers aren’t in most households, this form of regulation would set a dangerous precedent. Government mandating on-device censors which are maintained by corporate algorithms is bad. It won’t work. It consolidates corporate power. It criminalizes and blocks the grassroots innovation and empowerment which has defined the 3D-printer community. We need to roundly reject these onerous restraints on creation.