Man-in-the-Middle PCB Unlocks HP Ink Cartridges

September 28, 2024 by Maya Posch 149 Comments

It’s a well-known secret that inkjet ink is being kept at artificially high prices, which is why many opt to forego ‘genuine’ manufacturer cartridges and get third-party ones instead. Many of these third-party ones are so-called re-manufactured ones, where a third-party refills an empty OEM cartridge. This is increasingly being done due to digital rights management (DRM) reasons, with tracking chips added to each cartridge. These chip prohibit e.g. the manual refilling of empty cartridges with a syringe, but with the right tweak or attack can be bypassed, with [Jay Summet] showing off an interesting HP cartridge DRM bypass using a physical man-in-the-middle-attack.

This bypass takes the form of a flex PCB with contacts on both sides which align with those on the cartridge and those of the printer. What looks like a single IC in a QFN package is located on the cartridge side, with space for it created inside an apparently milled indentation in the cartridge’s plastic. This allows is to fit flush between the cartridge and HP inkjet printer, intercepting traffic and presumably telling the printer some sweet lies so that you can go on with that print job rather than dash out to the store to get some more overpriced Genuine HP-approved cartridges.

Not that HP isn’t aware or not ticked off about this, mind. Recently they threatened to brick HP printers that use third-party cartridges if detected, amidst vague handwaving about ‘hackers’ and ‘viruses’ and ‘protecting the users’ with their Dynamic Security DRM system. As the many lawsuits regarding this DRM system trickle their way through the legal system, it might be worth it to keep a monochrome laser printer standing by just in case the (HP) inkjet throws another vague error when all you want is to just print a text document.

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From Printer To Vinyl Cutter

July 2, 2021 by Matthew Carlson 14 Comments

Some might look at a cheap inkjet printer and see a clunky device that costs more to replace the ink than to buy a new one. [Abhishek Verma] saw an old inkjet printer and instead saw a smooth gantry and feed mechanism, the perfect platform to build his own DIY vinyl cutter.

The printer was carefully disassembled. The feed mechanism was reworked to be driven by a stepper motor with some 3D printed adapter plates. A solenoid-based push/pull mechanism for the cutting blade was added with a 3D printed housing along with a relay module. An Arduino Uno takes in commands from a computer with the help of a CNC GRBL shield.

What we love about this build is the ingenuity and reuse of parts inside the old printer. For example, the old PCB was cut and connectors were re-used. From the outside, it’s hard to believe that HP didn’t manufacture this as a vinyl cutter.

If you don’t have a printer on hand, you can always use your CNC as a vinyl cutter. But if you don’t have a CNC, [Abhishek] shares all the STL files for his cutter as well as the schematic. Video after the break.

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Inkjet Printing On The Cheap With A Continuous Ink System

December 6, 2019 by Lewin Day 39 Comments

Inkjet printers are cheap to buy, but expensive to run. Replacement cartridges can easily cost double the price of the hardware itself, leading many to decry the technology entirely. However, the hackers of the world have the problem licked – enter the continuous ink system.

[cprossu] wanted an affordable color printing solution for the hackerspace. A cheap printer was sourced from a thrift store. The model chosen was selected for its lack of cartridge DRM and the availability of kits on eBay for conversion to a continuous ink system. This involves running large refillable tanks of ink instead of small individual cartridges which must be thrown away when empty.

[cprossu] discusses both the challenges you’ll likely face in a general build, as well as the specific work required to handle the conversion on an Epson Artisan 725. There’s also excessive label-maker abuse, which always brings a smile to our face. It’s a conversion well worth considering if you find yourself regularly purchasing expensive cartridges. We’ve even seen similar builds as far back as 2009, right from the ground up!

HP Inkjet Printer Trains For Space

April 13, 2018 by Roger Cheng 27 Comments

The International Space Station is one of our leading frontiers of science and engineering, but it’s easy to forget that an exotic orbiting laboratory has basic needs shared with every terrestrial workplace. This includes humble office equipment like a printer. (The ink-on-paper kind.) And if you thought your office IT is slow to update their list of approved equipment, consider the standard issue NASA space printer draws from a stock of modified Epson Stylus 800s first flown on a space shuttle almost twenty years ago. HP signed on to provide a replacement, partnering with Simplexity who outlined their work as a case study upgrading HP’s OfficeJet 5740 design into the HP Envy ISS.

Simplexity provided more engineering detail than HP’s less technical page. Core parts of inkjet printing are already well suited for space and required no modification. Their low power consumption is valued when all power comes from solar panels, and ink flow is already controlled via methods independent of gravity. Most of the engineering work focused on paper handling in zero gravity, similar to the work necessary for its Epson predecessor. To verify gravity-independent operation on earth, Simplexity started by mounting their test units upside-down and worked their way up to testing in the cabin of an aircraft in free fall.

CollectSpace has a writeup with details outside Simplexity’s scope, covering why ISS needs a printer plus additional modifications made in the interest of crew safety. Standard injection-molded plastic parts were remade with an even more fire-resistant formulation of plastic. The fax/scanner portion of the device was removed due to concerns around its glass bed. Absorbent mats were attached inside the printer to catch any stray ink droplets.

NASA commissioned a production run for 50 printers, the first of which was delivered by SpaceX last week on board their CRS-14 mission. When it wears out, a future resupply mission will deliver its replacement drawn from this stock of space printers. Maybe a new inkjet printer isn’t as exciting as 3D printing in space or exploring space debris cleanup, but it’s still a part of keeping our orbital laboratory running.

[via Engadget]

Repurposing Inkjet Technology For 3D Printing

March 20, 2018 by Brian Benchoff 41 Comments

You would be forgiven for thinking that 3D printing is only about plastic filament and UV-curing resin. In fact, there are dozens of technologies that can be used to create 3D printed parts, ranging from welders mounted to CNC machines to the very careful application of inkjet cartridges. For this year’s Hackaday Prize, [Yvo de Haas] is modifying inkjet technology to create 3D objects. If he gets this working with off-the-shelf parts, this will be one of the most interesting advances for 3D printing in recent memory.

The core of this build is a modification of HP45 inkjet print heads to squirt something other than overpriced ink. To turn this into a 3D printer, [Yvo] is filling these ink cartridges with water or alcohol. This is then printed on a bed of powder, either gypsum, sugar, sand, or ceramic, with each layer printed, then covered with a fine layer of powder. All of this is built around a 3D printer with an X/Y axis gantry, a piston to lower the print volume, and a roller to draw more powder over the print.

The hardest part of this build is controlling the inkjet cartridge itself, but there’s prior work that makes this job easier. [Yvo] is successfully printing on paper with the HP45 cartridges, managing to spit out 150 x 150 pixel images, just by running the cartridge over a piece of paper. Already that’s exceptionally cool, great for graffiti, and something we can’t wait to see in a real, working printer.

You can check out [Yvo]’s handheld printing efforts below.

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A Functioning 3D Printer For 10€

August 26, 2017 by Jenny List 42 Comments

There was a time when crowdfunding websites were full of 3D printers at impossibly low prices. You knew that it would turn out to be either blatant vaporware or its delivery date would slip into the 2020s, but still there seemed always to be an eager queue ready to sign up. Even though there were promised models for under $200, $150, and then $100, there had to be a lower limit to the prices they were prepared to claim for their products. A $10 printer on Kickstarter for example would have been just a step too far.

There is a project that’s come close to that mark though, even though the magic figure is 10 euros rather than 10 dollars, so just short of 12 dollars at today’s exchange rate. [Michele Lizzit] has built a functioning 3D printer for himself, and claims that magic 10€ build price. How on earth has he done it? The answer lies in extensive use of scrap components, in this case from broken inkjet printers and an image scanner. These provide all the mechanical parts for the printer, leaving him only having to spend his 10€ on some hot end parts and the printer’s electronics. In an unusual move, the frame of the machine appears to come from a set of cardboard biscuit boxes, a master stroke of junk box construction.

The claimed resolution is 33µm, and using the position encoders from the inkjet printers he is able to make it a closed loop device. We salute his ingenuity in building such an impressive printer from so little, and were we ever locked by the bad guys in a room full of IT junk and lacked a handy escape device, we’d wish to be incarcerated with [Michele] any day over [Angus MacGyver] or [Sgt. Bosco BA Baracus].

You can see the printer in action in the video below the break.

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Re-Using The LCD & Button Assembly From A Broken Inkjet Printer

September 11, 2014 by Rich Bremer 22 Comments

Inkjet printers are a dime a dozen. You probably have taken old printers apart to scavenge parts like motors, pulleys, belts, switches, linear rods, power supply, etc. These parts are easy to reuse in other projects, unlike the controller portion of the printer which not as easy to make use of. [Blaupause] has done something very interesting, and it probably ranks in the ‘extreme difficulty’ category for most tinkerers. He has taken the front panel off an otherwise non-working Canon Pixma inkjet printer and has figured out a way to interface with it.

The front panel of this printer has the standard buttons that you would find on any ole printer, but the Pixmas also has a small LCD screen. [Blaupause] has written a library for the Olimexino microcontroller that can communicate with and make use of the repurposed front panel. And the neat part of this project is that the front panel’s on-board processor does the heavy lifting when it comes to displaying images on the LCD screen or checking button states which frees up your microcontroller to do whatever else. Right now, the LCD screen can display bitmaps and supports image transparency. The library can not display video as of yet, but that option is being worked on.

[Blaupause] makes all his hard work available to the public on the project’s Sourceforge page. In addition to the library, he also includes printer panel pinouts and detailed information on how to communicate with the buttons and LCD screen. Video after the break…

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