Jump to content

Recommended Posts

Posted · Ultimaker Original not working

Hey all,

Im having problems with my Ultimaker and I can't pinpoint the problem.

The error I get is a MINTEMP error on the Ulticontroller followed by a machine reset.

It happens when the thermocouple is touching anything. If it is outside the Aluminum block, it will read temperature right and no error. But once it touches the block, or I touch the cord with 2 fingers (not 1), we go right to a MINTEMP and then it resets.

I have:

- Checked all connections and used multimeter to ensure that they are working

- Flipped the yellow & red wires

- Replaced the thermocouple

- Yelled at it

Anyone have any ideas?

 

  • Link to post
    Share on other sites

    Posted · Ultimaker Original not working

    Sounds like some sort of grounding/shorting problem... Have you checked the heater cartridge... does the wiring on it look ok? What happens if you remove the heater cartridge from the block before you insert the thermocouple. Does the thermocouple still freak out?

     

  • Link to post
    Share on other sites

    Posted · Ultimaker Original not working

    I agree, it seems like a grounding problem.

    The heat cartridge looks fine. Removing it minimizes freakouts (there was only 1 MINTEMP in ~10 trials after I removed the block, as opposed to a 100% freakout rate).

    Another thing I noticed, I don't get errors when the ultimaker is on its side with the electronics exposed. I followed up a bit and found that if the white cables touch each other in the first 10 cm of cable leaving the board, I get an error

     

  • Link to post
    Share on other sites

    Posted · Ultimaker Original not working

    This one seems new to me. I don't think I"ve heard about this particular exact problem.

    Just a little explanation of how it should be working:

    The thermocouple goes up to a tiny circuit board on the print head. That board should be powered up (you can test it). The output signal from that board is a voltage from 0V to 5V where 5V is 500C and 0V is 0C and it's linear in between. So at room temp it should be around 20C and 200mv.

    Did you check those voltages there and also at the PCB under the UM?

    In the past people have reported problems where the temp is very sensitive to other wires near the thermocouple - before it gets to the tiny PCB on the print head. So keep those wires at least 1 cm away from the fan and heater wires. But once the voltage leaves the print head it tends not to be sensitive to noise but of course the wire can break and that's another common problem.

    So I'm surprised there would be an issue on the underside.

     

  • Link to post
    Share on other sites

    Posted · Ultimaker Original not working

    Yup, I checked the voltages. 'twas all good. I guess it was a wire proximity issue, the whole issue went away when I unplugged the fan.

    The fact that unplugging the fan fixed the problem boggled my mind beyond measure. I still haven't quite recovered :-/

     

  • Link to post
    Share on other sites

    Posted · Ultimaker Original not working

    Hi,

    For the ones getting a MINTEMP error - it can be due to a loose connector to the TC board.

    After a while the strains on the cable this connector can break.

    I fixed this by removing the connector and soldering the wires directly to the board.

    What you can also do is order a new connector and use crimp sockets to attach it to the wires. The connector you need is a Micro JST XH 2.54mm 3-pin T-1 plug which you can usually find on ebay. I had mine shipped from Hong Kong for a few cents each.

    Thanks

    Ralph

  • Link to post
    Share on other sites

    Create an account or sign in to comment

    You need to be a member in order to leave a comment

    Create an account

    Sign up for a new account in our community. It's easy!

    Register a new account

    Sign in

    Already have an account? Sign in here.

    Sign In Now
    • Our picks

      • Help Us Improve Cura – Join the Ultimaker Research Program
        🚀 Help Shape the Future of Cura and Digital Factory – Join Our Power User Research Program!
        We’re looking for active users of Cura and Digital Factory — across professional and educational use cases — to help us improve the next generation of our tools.
        Our Power User Research Program kicks off with a quick 15-minute interview to learn about your setup and workflows. If selected, you’ll be invited into a small group of users who get early access to features and help us shape the future of 3D printing software.

        🧪 What to Expect:
        A short 15-minute kickoff interview to help us get to know you If selected, bi-monthly research sessions (15–30 minutes) where we’ll test features, review workflows, or gather feedback Occasional invites to try out early prototypes or vote on upcoming improvements
        🎁 What You’ll Get:
         
        Selected participants receive a free 1-year Studio or Classroom license Early access to new features and tools A direct voice in what we build next
        👉 Interested? Please fill out this quick form
        Your feedback helps us make Cura Cloud more powerful, more intuitive, and more aligned with how you actually print and manage your workflow.
        Thanks for being part of the community,

        — The Ultimaker Software Team
        • 0 replies
      • Cura 5.10 stable released!
        The full stable release of Cura 5.10 has arrived, and it brings support for the new Ultimaker S8, as well as new materials and profiles for previously supported UltiMaker printers. Additionally, you can now control your models in Cura using a 3D SpaceMouse and more!
          • Thanks
          • Like
        • 18 replies
    ×
    ×
    • Create New...