Jump to content

Recommended Posts

Posted · UMO+ print head won't heat up anymore - relay turns off and on

As soon as the printer gets to start heating the printhead (either through starting a print, or going to "prepare=>preheat PLA1") the relay klicks off and then on again.

I've had problems with the connection of the adapter to the printer being a little too loose ever since I've had it, but this seems to be a permanent problem.

 

NB. Not quite new here. Used to be Alex+

  • Link to post
    Share on other sites

    Posted · UMO+ print head won't heat up anymore - relay turns off and on

    It's probably K1.  That's the only relay.  Here's how I fixed it.  That was in 2014 and it still works great:

     

     

  • Link to post
    Share on other sites

    Posted · UMO+ print head won't heat up anymore - relay turns off and on

    Tried this but it didnt solve the problem.

     

    Mind you, in my case the bed heats fine and the servos work as well.

     

    Any other ideas? (anyone 😀)

     

  • Link to post
    Share on other sites

    Posted · UMO+ print head won't heat up anymore - relay turns off and on

    Here's a little video of what's happening: https://youtu.be/N1u-zWsm9f0

     

  • Link to post
    Share on other sites

    Posted · UMO+ print head won't heat up anymore - relay turns off and on

    okay, your description of the problem was pretty bad, lol.  You took me down the wrong route.  There is nothing wrong with K1.

     

    What is happening is your power supply is turning off and on.  The power brick.  This causes your printer to reboot.  It happens quite quickly so I'd guess your heated bed is shorted.  Or maybe your power supply isn't powerful enough.  Was this a UMO upgrade?  When you upgrade you have to use the larger power supply.  Is it possible you are using the weaker power supply and your proper power supply is sitting around unused?

     

    You want the 221W supply that can put out 9.1 Amps.

     

    Alternatively the power supply may be bad.

     

    And finally you may have a short in your heated bed.  Do you have a multimeter?  Do you have a friend who is good with a multimeter?  The bed should be around 4 ohms.  If it's 2 ohms or lower then that's the problem - you have a short.  In fact if it's < 3.8 ohms that could be the problem.  Most likely you have a short and it's 0 ohms.  Shorts are quite easy to fix.  You have to check the wiring.  The most likely two locations would be where the cable connects to the heated bed as that gets some torque and stress.  The second most likely spot is where the power cable connects to the circuit board.  The wires may be touching and shorting out.  On either end of the cable.

  • Link to post
    Share on other sites

    Posted (edited) · UMO+ print head won't heat up anymore - relay turns off and on

    Ahaa! I found the culprit. You were (almost) right: There was short in the heater element of the print head (not the heated bed).

    Fixed it and it's merrily printing away again. 🙂

     

    Thanks!

     

    Edited by Umo_Alex
  • 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!
          • Like
        • 18 replies
    ×
    ×
    • Create New...