Jump to content
Ultimaker Community of 3D Printing Experts

Heated Bed Temp fluctuates

Recommended Posts

Posted (edited) · Heated Bed Temp fluctuates

on my UM3 when I printing at temperatures of the Heated Bed more than 60 degrees, I have an oscillation of the temperature about to 5 degrees in a short time (about 1 second).
The oscillation occurs only during the printing of certain parts such as external walls or when changes of direction.

I checked the resistance of the printing bed like this guide:
and they seem correct I have no other ideas on what to check.

Thnaks for your help.




Video: BedTemp.zip

Edited by Gio26
  • Link to post
    Share on other sites
    Posted · Heated Bed Temp fluctuates

    I think oscillation is normal on the heat bed, because there is only on/off, so in the software there is a threshold and if the temp is under this threshold, bed will be heated again for some seconds or until the temp is again higher than another threshold. So this "flapping" is more less normal in my opinion.


    But do you have problems with this flapping? Objects don't stick to the bed or something like that?

  • Link to post
    Share on other sites
    Posted · Heated Bed Temp fluctuates

    Hi ?

    ahh ok, no but now I have checked your video.

    Hmm, yes looks a little bit strange, I think mine is more stable. But I have no idea how to solve it. I think the temp sensor of the heat bed is "build in" the heat bed. You can only check if the cable is connected well to the board.

  • Link to post
    Share on other sites
    Posted · Heated Bed Temp fluctuates

    It's impossible for the bed to heat or cool that fast (3 degrees in 1/4 second).  It can't even heat or cool 1 degree in 2 seconds.


    It's a sensor error.  I don't know if there is electrical interference or a loose wire.  I'd give a gentle tug to the heater sensor wires both at the heated bed and at the circuit board.  It's more likely at the heated bed.  I would loosen the connector and remove and then re-insert the 2 sensor wires.  Also have the printer on, look at the bed temperature, and while looking at it, push on the connector with at least 1kg force in every direction to see if there is something loose.  It could easily be a bad solder connection under the screw-block where the wires go into the heated bed.  That was the problem with my UM2 (almost exact same design) - the solder joint wasn't good.  I had to reheat it with a soldering iron (this was years ago - it's been fine since).


    I don't think it's serious since it seems to be stable enough to keep the bed at a constant temperature but I'd try to fix it anyway.

  • Link to post
    Share on other sites
    Posted · Heated Bed Temp fluctuates

    Hi gr5,

    thanks a lot for your help, I really appreciate it.

    I will try what you suggested me.


    You are right, I don't have a problem with printing object, in any case I would like to fix it.


    Many Thnaks.

  • 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

      • Talking additive | The 3D printing podcast
        Why should we be the only ones asking questions? Join us and ask Jabil all your questions on September 22nd 5pm CET
          • Like
        • 3 replies
      • Ultimaker masterclass: Optimizing your Ultimaker Cura workflow
        Save your seat for either broadcast on September 23.
        What will you learn?
        · Best practices for iterative print preparation and every lesson you should learn from each print
        · The right way to use per-object settings and when they are most useful
        · Easy-to-use resources for anyone who wants to develop their own printer definitions, plugins, or print profiles
        · How to optimize print profile settings and whether to “keep” or “discard” changes
        · When is the right time to export your drawing from CAD? (Based on Ultimaker Cura’s surprising power as 3D control software)
        · And a whole lot more tips and tricks!
        How can I join?
        This free masterclass will take place twice:
        1. 11am CEST (5pm SGT, 5am EDT)
        2. 5pm CEST (11am EDT, 8am PDT, 11pm SGT)
          • Like
        • 0 replies
      • Do you use 3D printing at work? Let us know
        It doesn't matter if you are using 1 Ultimaker or 10, there is inspiration in everything. We're looking for ...
        • 1 reply
    • Create New...