[3MAR2016 Note: A much newer, better method has been developed and is documented in this post.]

A common question among commenters to this blog when I write about my Stratasys FDM 1600 is “how did you hack the cartridge?”  Newer Stratasys machines such as the Dimension series (P-Class machines – I assume named after the Prodigy, which I think was the first Stratasys machine to use cartridges) don’t have plain old wire welding type spools like the old FDM series – instead, they have the filament stored in a large cassette.  This is nice as it keeps the filament dry without having to keep it in a dry box and it makes loading in new material (or swapping colors) a breeze.  On the down side (as many Stratasys owners have apparently discovered), Stratasys went the route of inkjet printer manufacturers and have ‘chipped’ their cartridges so that you can’t simply refill the cartridge with material and continue on.  While this isn’t a hindrance to me and my old machine, I’ve still been curious to know if there’s a way around this (if I ever come across a Dimension for cheap, I’ll need a way to feed it as well).  Note: I understand the big T-class machines (named after the Titan model, I assume) still use large spools, though I believe the spools also have a chip module (but hey, if you can afford to buy a T-class, the consumables cost probably isn’t a big concern).

Inside each Stratasys cartridge is a Maxim DS2433 one-wire EEPROM (in a SO-8 package) that the machine communicates with. This is a simple 4kb (that’s kilobits – only 512 bytes of storage) device, and reading/writing them is reasonably straightforward – a library most likely exists for 1-wire communication no matter what your microcontroller of choice is (Arduino enthusiasts, look here). Dumping the contents of one yields hexadecimal gibberish, unfortunately. What’s more, you can’t simply clone one of them, as each has a unique 48-bit serial number lasered onto the die at the time of production, and this serial (presumably) is used as the seed to encrypt/obfuscate the EEPROM data. This has been enough to dissuade most tinkerers from playing further with the system, though Bolson Materials may very well have cracked the code, as they are able to provide new EEPROMs with their cartridge refill spools.

Thanks to some hacking by the shadowy figure known as ‘Dervish’, it’s been found that only a small portion (12 bytes) of the EEPROM is dedicated to storing how much material is left on the spool.  As a cartridge was used, the EEPROM was read out at various points and only bytes 0×58-0×63 changed over the life of a cartridge.  Specifically, here’s the layout of data on the EEPROM as known thus far as a result of reading EEPROMs from several brand new cartridges:

0×00-0×41: scrambled data (commenter lgg2 noted that 0×28-0×2F is identical to 0×30-0×37, highlighted in purple)
0×42-0×45: 0×00000000
0×46-0×47: scrambled data
0×48-0×4A: 0×55AA55 (highlighted in green)
0×4B-0×4D: scrambled data
0×4E-0×4F: 0×71BE, 0×72BE, 0×73BE, 0×74BE, or 0×75BE
0×50-0×51: scrambled data
0×52-0×57: 0×000000000000
0×58-0×63: filament remaining (scrambled data, highlighted in yellow) – on an unused spool, 0×62-0×63 is always 0×4BB9, but this gets modified (along with 0×58-0×61) as the cartridge is used.  Perhaps 0×62-0×63 is an unencrypted checksum?
0×64-0×67: 0×00000000
0×68-0×70: 0×535452415441535953 (‘STRATASYS’ in ASCII, highlighted in dark blue)
0×71-0×1FF: scrambled data

Simple enough, right?  Just read in the EEPROM at 100% full, respool it with generic material when empty and write the 100% full data back to the EEPROM…  Well, not quite.  You can certainly use this respooled cartridge in a different machine, but not in the same one, as they remember what cartridges they’ve already used (that serial number on the EEPROM).  This is where Dervish tore into the guts of the machine and began the really clever hacking.  When you open up the side panel of a Dimension, here’s what you see (image taken from Brad Rigdon’s Print To 3D gallery):

Brad also has a nice video on youtube that shows the full workings of the machine. The electronics appear to be composed of 3 boards – the large PDB (Power Distribution Board) on the left, the SBC (Single Board Computer, just a PC) in the center right above the hard drive, and what appears to be a motion controller board (in the upper right, connected to the SBC via a 16-bit PC/104 header). As per the troubleshooting section of the Dimension/SST Service Guide, the motion controller board in the upper right is known as the ‘186 board’.  The SBC pictured appears to be an Ampro P5v, though some Dimensions use a Nova-600.  After connecting a keyboard and monitor to the SBC, Dervish found that the computer is running Linux (Red Hat 8, specifically – not Fedora 8, but the circa 2002 version with a 2.4.x kernel).

By rebooting the system he was able to enter single user mode (at the LILO prompt, enter ‘linux single’) and could change the root password to whatever was desired (type ‘passwd’ at the prompt, enter a new password, then enter again to confirm). After rebooting once more into standard mode as root with his newly minted password, he modified /etc/sysconfig/iptables to open up port 22 so that he could ssh into the system and hack remotely without having to be at the console itself (the sshd daemon does not run by default, so adding the line ‘/etc/init.d/sshd start’ to /etc/rc.local is also required).   While he had been able to modify temperatures on the machine by using Stratasys’s ‘Maraca’ software (the CatalystEX software offers no ability to tweak the system), direct access to the SBC allows much greater control over process parameters such as adjusting rollback.  All the configurations are stored within the /mariner/config tree (the hard drive image covers multiple models), and it can be tricky to determine which ‘gender’ (kona, lanai, spinnaker, oahu etc.) corresponds to a given machine, but noting which directory has the most recent modification date is a dead giveaway.

The holy grail turned out to be the discovery of an innocuous sounding file named ’system.dat’ located in the root directory.  This is where the Dimension apparently stores a list (in binary) of all the cartridge EEPROM serial numbers that it has seen before.  Delete this file and the machine gets amnesia, allowing respooled cartridges (with the EEPROM rewritten to show 100% full) to be used again.  I assume creating a cron job to delete this file periodically (or using rc.local to delete it on startup) would also work.

As far as I know, this constitutes the cutting edge of Stratasys hacking – I’ve heard rumors before of people having bypassed the cartridge EEPROMs, but this is the first concrete information I’ve seen on how to accomplish it.  If anyone has further information, please leave a comment!

244 comments so far

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  1. Very good info.


  2. Another curiosity,

    In the offsets 0×28-0×2F // 0×30-0×37 had the same bytes.

    • Excellent find – I can confirm that this appears to be the case, and I updated the overview.

  3. Hi, i’m having Curling Part problems on my dimension elite, and i’m looking for Maraca Software. Have an idea ? Could not find it on the web and you seems to know a lot about FDM.
    Thanks, Franck (frenchie)

    • Franck -

      This guide has some suggestions on reducing curling and other issues: http://www.aetlabs.com/files/downloads/Part%20Qlty%20TS%20Guide.pdf

      • Bonjour, moi aussi j’aimerais bien réussir à utiliser du fil d’ABS moins cher que ce que vendent les revendeurs de STRATASYS car c’est un sérieux frein pour imprimer des objets.
        J’ai vu que tu es français et c’est plus facile pour moi qu’en anglais.
        Si tu as des infos à me communiquer, je t’en serasi très reconnaissant.

  4. Hello!
    This hack work fine only with old printer models.
    The new one – stratasys uprintplus has another cartrige.
    It consists of protected eeprom with SHA-1and limit switch. (family code B3h – (maybe like ds2432 – 33h ?))
    Eeprom has secret code, and printer send data with encryption.
    I can read rom memory and find 12 “wonderful” bytes on full chip, (for used chip consist of 16 bytes)
    but i can’t rewrite this data to empty chip without secret code …. (
    now i try to logging communication protocol and analyze it… hope it helps

    • Very interesting! I suppose this may be in response to Bolson supposedly cracking the code for the Dimension cartridges. I wonder if they’re using the same secret across all cartridges? I can’t find any mention of a 0xB3 family code for 1-wire devices – does the EEPROM have any markings on it?

      From reading the abbreviated datasheet on the DS2432 (the full datasheet is apparently confidential, but this might be it: http://www.ibutton.ru/pdf/Dallas_Sem/1-Wire/DS2432.pdf), you can supply a new secret to the chip without knowing the old one, but if the printer is still trying to use the old one, writes aren’t going to work (and since Stratasys started verifying writes to the EEPROM at some point, it will probably flag the cartridge as bad). Sure, you can sniff the communications and find the MAC for a given write command, but then you’d have to brute-force the SHA-1 hash (good luck with that).

      Seems the best way to get around this would be to build an EEPROM simulator that the printer can talk to – if the simulator accepts any MAC provided, it should be able to fool the printer.

  5. Very interesting post!

    Certainly makes me glad I’ve got a ‘1650 that didn’t have a chip….


  6. Hello!

    There is no marking on chip. It looks like piece of Si with epoxy resin around it.
    May be it is DS28E10 ( http://www.maxim-ic.com/datasheet/index.mvp/id/6577 ) . I cant find full datasheet with family number.

    The problem is – MAC calculated using a) secret code and b) data to write. So I couldn’t get chip back to 100% only to 99%, if sniff this write sequence.

    there are two ways
    1) if secret is constant – sniff first write sequence and use it in future for this chip.
    2) if secret may change (ds2432 allows that), it’s a problem, may be we need disassemble software part.

    interesting facts
    - i cant simply change eeprom to the another one (without write protection), printer constantly check authentication.
    - if i remove chip from working printer it continue his work but stay on pause after each layer of model. after reboot and connecting the chip back printer display original chip state.

    Building the full emulator is not so easy as reader/writer and I don’t know would printer check written data.

  7. As an owner of dimension 3d printer, that works on stratasys system, I am very interested in discovery you made. At this point I would like to ask, if this also works on dimension bst 768 printer.
    With best regards Jernej

    • Yes, this technique works on the BST 768.

  8. I owe Dervish some beer (a lot of beer!). hooking up the vga and keyboard was not a practical option on my 768 (headers,no connectors). i just pulled the hard drive and mounted it on a ubuntu linux box and turned on ssh by doing some editing.. from there, followed the lead on killing the system.dat file on bootup…
    works perfect
    thanks to my genius friend TOM (who is definately getting a case of dogfish head 60 minute IPA)..

    JJ — off to print!

  9. Thank you for the answer, I really appreciate it.

  10. My report about analyzing chip’s protocol with SHA1 :

    Chip has family code B3h, but seems fully compatible with ds2433 (33h) commands system.
    Authorization packet consists of write buffer command, read memory command, calculation MAC command.
    MAC calculated using a+b+c
    a) data stored in memory
    b) data stored in buffer
    c) secret code
    So I know MAC result, a), b), and i don’t know c).
    The bad news – 8 bytes unknown data is very bad.
    I wrote simple program calculating SHA1 hash – 6000 hash/s (athlon 1500MHz)
    Commercial avaible cuda GPU bruteforcer – 100M hash/s
    Possibility of FPGA bruteforcer 1-10G hash/s
    All these cases are too slow.
    Maybe it is possible to use electrical sharp tip directly inside the chip and to measure out voltage of secret code trigger’s. But i haven’t such qualification and such equipment.
    the good news – current version of program has minor bug, and it allows us using the same chips.

    • Fantastic information, thanks! I agree, brute forcing the hash isn’t practical at this time, especially when there are weaker areas to investigate for the MAC.

  11. Anyone know where I can get hold of a copy of the Maraca software?

  12. Hello, Arduino Enthusiast here,
    Would someone please help me or point me in the right direction to figure out how to read the hex values of the chip. I have an arduino, a 4.7k resistor, a multimeter and the small GF201 switch with the eeprom on it. THough I have all of this, I cannot figure out which pins to connect to, or what code I should be using in the arudino IDE. Any help would be much appreciated

    • Use the 1wire Library and ther are sone sample progs there — start with something like a DS18B20 temp sensor to get going…

  13. Did you notice that on new spools offsets 0×38-0×3F // 0×58-0×5F are the same???
    0×40-0×41 // 0×60-0×61 could be checksums or something

    • I didn’t notice that – excellent catch! I think it’s safe to assume that 0×38-0×3F contains the original amount of material on the spool. I’ll have to update the post when I get a chance.

  14. And 0×4E-0×4F I think are related to manufacture date of production (week), and I’m figuring it out how to calculate them

    • Actually, I think 0×28-0×2F and 0×30-0×37 are the manufacturing and first use dates. I noticed in a log file from a machine that these two values were identical when read – apparently Stratasys doesn’t update the ‘initial use’ field in the EEPROM.

      • Can you drop me a line?, I would like to check some topics on EEPROM readings

        • Sent you an email – post here again if you didn’t get it.

          • How can one read/write to EEPROM ds2433 chip using arduino?
            Does anybody have a code that we can use?

            Thank you!!

  15. Hey Blue, sorry but I’ve been away on vacation. I am writting you a mail tomorrow. Cheers!

  16. Hello,
    Is it possible to contact ‘Dervish’ cause at the moment we are connecting a keyboard to a dimension 3D printer, and maybe he could provide some help for us.

    • I haven’t heard from Dervish in a while, but connecting the keyboard and monitor isn’t hard – you just need the correct cable set from the maker of the SBC.

  17. Hello Blue

    I am have a FDM2000 but no software.
    Where can i get the sotware to run this machine.
    Stratasys no longer supports this model
    Any help would be great
    Thank you

  18. I’ve got four questions.
    1) Is there someone who can send me the maraca software
    2) Does anybody can show me, with print screens, how to open port 22?
    3) How can you modify the temperature of the heating head?
    4) Where can I modify the distance between the support and model heating heads?



  19. I have a stratasys prodigy plus, and while fooling around in the Linux system, accidentally overwrote a file called lcdcmds. I was wondering if anyone on this blog could get another copy for me? It doesn’t seem to be stored anywhere else! :(

    • Do you have a firmware package that you can re-upload? That’s probably the best way to fix it, as that file may get changed as new firmware versions are released.

  20. I would like to reload the chip on a stratasys spool to reuse the material left on the spool. I am using an arduino uno with a maxim ds2433 eeprom to read/write the .hex file in an attempt to reload the chip. Any advice on the code to make this happen?

  21. I’m tempted to try this on my printer at work… just got a 1200es. is there a way to SSH into the SBC without having to remove it? I noticed a com port in the back of the printer.

  22. Nevermind – just noticed the answer

  23. Hi guys, i have the Stratasys Fortus 250mc and i’m trying to refill the spool. I see that most of you doesn’t have the right tool to read/write the 1wire eeprom… well you can buy for cheap the buspirate from http://dangerousprototypes.com . It will let you do anything you want on some serial bus (usart, spi, i2c) 1-wire included. I’m using it and it works great, you just need to write a sw interface to fill the addresses with your data.
    My problem is that i found inside /mariner/config/ the system.dat file, but even if i remove it, the machine regenerate the file and doesn’t accept the spool with the reloaded dump (give “material error…”). do you have any idea?? Fla

    • The system.dat file to delete is the on in the root directory, not anything in /mariner/config. [edit] I stand corrected – I wasn’t aware that it appears in /mariner/config in newer firmware versions.

  24. I want to refill some cartridges for a BST 768.

    Do I have to dump the EEPROM when the cartridge is new? Can I find a way to refill all the old cartridges which don’t have virgin EEPROM dumps?

    Flavio, could you provide any further information on using the BusPirate with the 1wire eeproms?

    • Correct, you need to get an EEPROM dump before you start using a new cartridge. There is no way to refill a cartridge chip unless you read out the EEPROM when new (unless you work for Stratasys and have access to the program that generates the EEPROM data).

      • I have access to more than a few empty cartridges, would it help if I could produce a dump for each of them? If anyone is interested in that data, let me know.

        Can someone point me to a good resource for reading/writing these EEPROMs with an Arduino or BusPirate? I googled a bit but failed to find anything good.

        • Empty cartridge dumps won’t be of much help, but full ones might. I’ve read out the EEPROMs with a Bus Pirate, but it required cutting the trace on the EEPROM board for the resistor. I still need to try using a 12v power source, as I think that’s the trick to getting a read.

          • Have Blue, could you detail where to cut the trace / use a 12V power source? I was under the impression one simply had to connect the ground (to pin 3), and a 4.7k ohm resistor between data and pin 4.

            • Dan, I’m actually hoping to do a blog post on reading an EEPROM with a BusPirate. The problem with the Stratasys EEPROM board is that the resistor in place is a 4.7k pullDOWN and not a pullup. I think this is why 12v is required.

            • You don’t need to cut the trace to read a cartidge with bus pirate. Connect the bus pirate to trace closest to hole to GND and other trace connect to MOSI. Connect the bus pirate to the computer USB. Start a terminal program (I used Realterm) and connect to COM for bus pirate (mine was COM2) @ 11520 buad, no parity, 6 data bits, & 1 stop bit.

              In the open terminal window:

              1) Type ‘m’ for menu.
              2) Type ‘2′ for 1-Wire.
              3) Type ‘w’ for power supply.
              4) Type ‘P’ for pull-up resistor.
              5) Type ‘[‘ for bus reset.
              6) Type ‘240′ for search.
              7) Type ‘204′ for skip ROM function.
              8) Type ‘(0×55)(1) 0xf0 0×00 0×00 r:512′ for dump.

              Save the dumped data from the terminal window.

            • Well, there you go! Thanks, John – I was concerned that the resistor would mess with getting a good read with the Bus Pirate. I’ll have to give it a try myself.

            • Is there any Progress on this? I’m also trying to get a read from it with an Arduino but it won’t work.

              Is it even possible with an Arduino or do I Need to get a Bus Pirate? I don’t want to cut a trace or anything non reversable because I’m trying to build a deviece to simple scan the chip and write it back later.

  25. Hello I have a Dimension Elite, and during the operation the power was cutted. The machine starts but the display didn´t show anything. I do the Cycling Power procedure but, the machine don´t power off. Some can help me with problem?

    • Sounds like you may have some filesystem corruption – best to hook up a keyboard and monitor to see what bootup messages there are.

      • Thank you, yesterday we connect a Keyboard and monitor and we saw that one of the file it´s damage. To repair this file I need a password, to enter into the repair console, but I don´t have one. Do you which can be password or where can I find it?

        Best Regards


        • If it’s asking for the root password, there is no valid root password by default – you’ll need to boot the machine into single user mode and create a valid password.

  26. Hey there
    I have a BST, which doesn’t get past boot up stage, I am wondering if I may be able to have a direct copy of the firmware data? it passes the HD testing stage, requires a password ( to which it says incorrect, and says expected 1×72344 (or something, i cannot remember the numbers) found FxFFFFF
    Im a little clueless :D so any help would be very gratefully received! Thanks

    • I wonder if you’re having the same difficulty as Emiliano above… Can you boot into single user mode and set a root password?

      • Maybe! i can login as single and change the root password however i am still coming up against the same problems which says

        Master login : DPM: Invalid signature: Expected 53595353 got ffffffff
        DPM : Failed to aquire 28 byte I/O memory range at 0xd1000

        DPM : revision 1 controller with memory size of 8188 bytes

        DPM : revision 1 little endian controller with a 8188 byte dual port memory

        I know the hard drive is on its way out (noisy!), and have tried to get a ghost image of it before it dies with little success as it skips some partitions saying they are damaged. could this be the problem? Thanks!

        • Ah, that error seems to indicate difficulty with communicating with the controller board. It’s possible that hard drive corruption could be causing the issue, but it’s hard to say. I’ve used SpinRite (http://www.grc.com/sr/spinrite.htm) before to recover/repair bad sectors – might be worth a try.

  27. As you can see, the bytes from $0038 to $003F are same than $0058 to $005F, where the spool material left lives. Can you tell me the name of the cartridge where you do this dump?. Usually, the cartridge has the follow names: P401_GRY or similar (depending the material features and color). I’m sure the cartridfe name’s is inside this bytes (between $0058 and $005F).

    Best regards.

    • I don’t know what specific material code that dump would have read out, though I think it was probably just ‘P400′. For various reasons, I really don’t think that specific string is encoded on the EEPROM – I’m sure it’s just a numeric identifier which corresponds to ‘P400′, ‘PC_ABS’, ‘P430_NAT’, etc.

  28. i am not an expert. But do you guys know if i put diode on the eeprom which is 100% so machine can’t write on eeprom.
    Does it make sence?

    • I understand what you’re suggesting, but it won’t work – since the EEPROM is a 1-wire unit, there is no write protect pin or any other line that can be toyed with. Since there’s only a single pin for input data, output data, and parasitic power supply, anything that affects writing will also affect reading.

  29. Dear have blue

    Im Daniel, from Buenos Aires Argentina.
    I have read your explanation and was enjoy it, English isnt my lenguage, but I understood in genral.
    I dont know nothing about electronic, but I looking for about haked a uprint material chip , and you give me a good information about Bloson material.

    I by pass the security equipment, and could used a genric material in the machin, but I couls made this in the mechanical way .
    The proces its not complicate, you need put a original spool and when the equipment pull the material in, you must disconect the house and at the same time introduce by the house the generic material, when the generic material arrived to the extruder the original one stop and the machine pull for the genric one, during the construction proces the counting stop , you preserve the total live of the original spool and chip but used the generic one.

    I whish you could understand my primitive english.


    • Daniel I am very interested in understanding more abbout what you did. Are we talking about the old spool that came incased? Hoy did yuo manage to introduce the material in the house??

      • Dear Monko

        i have the Uprint model, its a small one, on the back have two hose, one for the material and other for the support, in other models the hoses are inside the equipment.

        The steps are the following.

        Firts, discharge the material
        Secomd disconect the material hose, and introduce the generic material in the machine , but stop before arrived into the extruder.

        Introduce the original material cartridge in the machine and charge it, the filament will into the machine and go out ( becouse you desconected the hose).
        When the material go out you must push the generic material into the machine until will be catch for the extruder motor, at this moment the original material stop, becouse the extruder motor take que control and pull the material, but are pulling the generic one,

        Conclusion, all the time you used the generic material an d not the original , and because the counting mechanism work when the original material run, the chip didnt change in the charge percent.

        So sorry for my dab explanation, if you need I could take some pictures for you.


      • Sorry, one detaill, the generic material must be introduce in the machine by the hose, like if the original material continue through the hose.

    • Daniel -

      When does the printer actually write back to the EEPROM? Is there an encoder on the uPrint that monitors how much filament has been fed out of the cartridge itself?

      • I really dont know which is the eeprom, I guess understand your question and I try to response.

        I used this process every time when the spool chip have only 1 or 2% , and I could print practicaly one generic spool whith 1 or 2% .

        Im not understand very well the electronic mechanism and in particular what do the machine to count the filament, but probing i could by pass this counting.

        If you whised ask me other think please dont hesitate.


  30. Assuming the guts are at the rear of the machine, does the entire metal case need to be removed to get to it? Once open and I get SSH working, how do I then connect?

    I need to calibrate the table/head distance so will be hunting for a config or knowing my luck it will be in binary


    • The guts are at the rear – you’ll need to use appropriate keyboard and monitor adapter cables to get into single user mode. It’s just a panel that you’ll need to open – should be easy to access the SBC. Once you have SSH running, you can connect directly over the network – no further need for the monitor and keyboard.

  31. Does anybody know of the current, new, Stratasys cartridges can still be hacked as described in this post? Is it the same EEPROM being used?

    Also, thought on disconnecting the spool sensor with the new cartridge, such that the amount of material remaining is never decreased, and it can be continually reloaded?

  32. [...] all of this would not have been possible without HaveBlue and his post over at haveblue.org that details a few key points about these printers (it may work for more than just SST 768, please [...]

  33. [...] to another helpful blog post, I discovered that the SBC was an Ampro P5v – which was awesome, because the label for the [...]

  34. I have lots of Model Material which is showing 0%. Let me know if any one is interested.
    I would be happy if some one can use them.
    My coordinates are

    • I’ve not confirmed chip swap actually works on my Uprint ESplus- but would be happy to swap a chip to test it with you. If it works I too have several 0′ed chips– we could swap all. what machine do you have?
      write me at MrGreatRakes@Gmail.com

  35. Daniel- you are a genius. The mechanical hack worked on my Uprint ESplus.

    So all you folks who are reprogramming your code – which i don’t understand- if you pull the hose off the back and jam in the generic filament it sucks it in- but does not remove % from the chip. Done. sounds crazy but works.
    I’ve been running a test- I pulled out a spool and put new filament in the cartridge- but with the original chip. i started the loading process. when the new filament came out of the hose i pushed the original filament manually into the now open hole till it was recognized and the pulled in from the head by the motor. My part has been building but the chip has NOT been counting down. its weird because you have to have an extra spool on the outside of the machine, and i have no idea what in cartridge would make it count down… but apparently if the filament isn’t moving thru the cartridge it doesn’t count down.
    Now i can get material from other places!! 4 spools for the price of one from SYS. Glow in the Dark her i come.

    • drat. spoke too soon. too good to be true. my % is going down— but seems slower. i’ll update.

  36. and in return…. my hack.
    You can reuse the trays about a million times.
    After each use- scrape flat.
    Fold a paper towel into a flat pad. dip it in Acetone and give it a series of quick wipes. The tray will look shiny but parts will stick great. In fact i was having trouble with my factory trays when i was being meticulous and buying new ones. Now i am abusive- a quick wipe of Acetone and boom, never a peeling part.

  37. For the record, I tried imaging the hard drive for my Uprint ES plus, running the machine and then re-imaging as discussed way above- It did NOT reset the clock for the chip. Perhaps they’ve upgraded the chip to write as well. the chips on these spools have 4 contacts.

    Any similar experiences?

    • The EEPROMs have always been written to – this is what allowed you to swap between different color cartridges (even between different machines), yet retain an accurate count of how much material was left.

  38. Hi, I’m a student at a high school and am very privileged to have a 3-d 1200es printer at my school. Though due to the high cost of printer cartridges from dimension, we aren’t allowed to use it (much). If we were able to use material from companies like Makerbot, we would be allowed and probably be encouraged to use the printer. We have a few empty cartridges lying around with chips in them and I also have a Arduino. Although i haven’t programed anything with 1-wire communication. The main issue is that since it is a school printer, I’m not allowed to take apart the printer because of insurance. I am allowed to mess with a cartridge and do whatever i want with them, plus i’m allowed to reset the printer. Plus with a set plan i might be able to convince my teacher to let me have a go at erasing the serial numbers on the printer as long as i can do it from a remote computer.
    Any and all help would be appreciated. Send me a email @ justinhockey@gmail.com

    • Wow, a 1200es – you are indeed privileged! I’m really disappointed that your school limits your access to the machine just because the materials are pricey – the 1200es is probably a good $35k-$40k machine, so that’s a bit like saying “no, you can’t drive the Ferrari because premium unleaded is so expensive”.

      If I were in your position, I’d suggest to the powers-that-be that the school sell off the 1200es and get a bunch of Makerbots instead. Heck, the yearly maintenance fee that Stratasys is charging your school for the 1200es would cover a Replicator by itself, and then you’d be able to run PA-747 filament all day long from a variety of sources. This is actually what Frankie did for UWM’s Digital Craft Research Lab – we had been hoping to get a used old model Stratasys for several thousand dollars, but Frankie wound up building a fleet of RepRaps for the same price instead. You may not be able to provide every student in a class with their own machine, but you’d be able to do much, much more than with just the 1200es.

  39. Hi Blue,

    First of all thank you very much for this and other posts they’ve been very helpful. We have a uPrint printer and with your help we successfully hacked the machine so we can use Makerbot material instead of the expensive stuff that Stratasys sells. Our printer is running Fedora instead of RedHat and for installing the script we removed the hard drive from the printer and modified the files directly from a virtual machine. If it is any help we can post a more detailed description of what we did.

    Since the Makerbot material is a little bit thicker (1.75mm) from the original Stratasys (1.6mm from measurements we did) we are a little concerned about the extra mechanical effort (in the long run) or some overheating that the motor can have. So what we are trying to do now is to change the speed of the model material motor. In the configuration file of the printer there are a lot of parameters but we can find any that may be the speed. There are the PID values for the head motor, but without the behavioral model of the motor I don’t know if it can help us. Well if you are familiar with this file and/or if you want to help us I can send it to you so you can take a look.

    P. S.: We have the Maraca EX 3.0 software but really didn’t help, we could only change temperatures, plus the model of our printer is not in the list.

    • Hey CesarN,

      I was wondering if you could post a detailed how to of how you got it to work for you. I saw you responded to Fabiano about what you did but was hoping you could explain it in more newbie friendly terms. Thanks!

  40. Sorry for the english, I use google translator. I’m from Brazil and I have a Uprint, phaco like to know how to use generic cartridges? I have a problem with counting the eeprom. thank you

    • Hi Fabiano,

      I’ll tell you what we did.
      First of all we connected with a serial cable to the DIAG port that is in the back of the printer. You can use hiperterminal or any other software like that to make the connection. The parameters are baud 38400, 8 data bits, 1 stop bit, no parity, no flow control. To read the EEPROM you have to type the command:

      er 0 0 0 128

      For the model material. And:

      er 1 0 0 128

      For the support material.
      This will throws something like this:

      Model carrier ID (8 8-bit values)
      000000: b3 a6 33 04 d0 14 10 bd ..3…..

      Model carrier in bay 0: 128 bytes at address 0 (128 8-bit values)
      000000: 06 4b aa e4 cc eb 9c dd f8 01 49 0b 12 ca f7 99 .K……..I…..
      000016: 1d 7a bf da a8 dc 68 60 c9 04 12 ac de 6c 4b 29 .z….h`…..lK)
      000032: 2e 91 67 93 5f 2a 91 e5 8f 71 6e fe cc 63 79 5c ..g._*…qn..cy\
      000048: 8f 71 6e fe cc 63 79 5c bf dd ab d7 c6 22 d5 c6 .qn..cy\…..”..
      000064: 22 6b 00 00 00 00 49 f9 55 aa 55 4d 45 01 5e be “k….I.U.UME.^.
      000080: 13 de 00 00 00 00 00 00 bf dd ab d7 c6 22 d5 c6 ………….”..
      000096: 69 b0 11 90 00 00 00 00 53 54 52 41 54 41 53 59 i…….STRATASY
      000112: 53 94 76 71 a1 7d e7 1d 09 22 1d 33 e9 96 d7 f9 S.vq.}…”.3….

      Then you have to arrange the data in order to write it to the EEPROM in this format


      This –> ” “<– are very important.

      To write the data you type the next command

      ew 0 0 0 "data" For model
      ew 1 0 0 "data" For support

      Like this:

      ew 0 0 0 "06,4b,aa,e4,cc,eb,9c,dd,f8,01,49,0b,12,ca,f7,99,1d,7a,bf,da,a8,dc,68,60,c9,04,12,ac,de,6c,4b,29,2e,91,67,93,5f,2a,91,e5,8f,71,6e,fe,cc,63,79,5c,8f,71,6e,fe,cc,63,79,5c,bf,dd,ab,d7,c6,22,d5,c6,22,6b,00,00,00,00,49,f9,55,aa,55,4d,45,01,5e,be,13,de,00,00,00,00,00,00,bf,dd,ab,d7,c6,22,d5,c6,69,b0,11,90,00,00,00,00,53,54,52,41,54,41,53,59,53,94,76,71,a1,7d,e7,1d,09,22,1d,33,e9,96,d7,f9"

  41. sorry, but do not understand anything, would have an easier way to explain?

  42. hitch when the cable on the machine and the computer, a message on the machine power failure, low battery output. What do you mean?

  43. I connected the cable to the DIAG output and the computer, but not nothing happens, would have to download some program?

  44. My school has a uprint by dimensions printer and I was wondering if this hack would still work for it. It uses p430 cartridges and I was wondering how you would change those

  45. Hello! (and greetings to Milwaukee Makerspace from Pumping Station: One!)

    I work at a college in Chicago that happens to have a Dimension sst1200 with an expired service contract… and I’ve been given permission to modify the machine (to reduce the cost of printing for students). Unfortunately, the machine’s firmware has been updated to the latest one, and it seems that there are some differences between your findings and mine.

    I’ve got an image of the HD, hexdumps from cartridges at all states (new in box, new in machine, used and not empty, and empty), Maraca 4.0, and a serial connection to the DIAG port on the back of the machine.

    I’ve been teaching our old Stratasys technician a few things about the machine as well!

    I was hoping I’d be able to pick your brain on some things! Is there any chance I could email you some of the questions I had?

    And if you get a chance, tell everyone at Milwaukee Makerspace that TensorFlux says hello! I hope the new space is treating you well :)


    • Hey, greets to the PS:1 crew! We’re not moved into the new space yet (still getting the place prepped), but we’re really stoked about it! On the printer, definitely drop me a line – if you’ve been given permission to hack the machine, I’d love to come down and poke at it myself, as I have no access to any modern Stratasys machines.

      • any news on recharge chip uprint? Thanks

        • Nothing yet, but I’m seeing if I can get a few uPrint EEPROMs to look at, as well as trying to find a uPrint to experiment with.

  46. I work with a uprint plus and previously a ST768, and I am very pissed with the toll printing system (I have about 100 spent uprint chips sigh). So pissed I built a tantillus (excellent printer). I wouldn’t be so pissed, if they just charge double or tripple the going rate of ABS, but at times 10 the going rate your having a laugh.

    Anyhow I have been in touch with Bolson, and for the last year and a bit, and they have said there material for the uprint is not far away, however that is always what they say. I even offered to buy a chip re-programmer from Bolson with no luck.

    So thank-you all for these great comments. I am going to try some of these things over the next few months, fingers crossed there is a way to bulk feed (<1Kg Spool) the uprint!

  47. Hello!

    Can anyone explain the exactly hardware and firmware differences between the SST 768 and the Elite? It seems to be identical machines. Would not be possible to “upgrade” a SST 768 to a Elite?

    Also, would be possible to use the Insight software to create valid CMB files to be used on the SST 786? The Catalyst are very limited and the SST could do more.

  48. Also interested if the hack can be applied to SST1200es.

  49. Hey guys, I write from Argetina, I have a SST768 and in my country it costs a cartridge around $ 600, so using it is very expensive, I have carefully read the post for reusing the cartridges but it is very difficult for those who have no knowledge electronica. They may do a step by step tutorial to do so?

    Thanks for your feedback.

  50. I forgot, someone has the latest version of CATALYST for my sst768?

    Thanks for your feedback.