Jump to content

is the Fan Speed Min setting ignored in CURA?


Recommended Posts

Posted · is the Fan Speed Min setting ignored in CURA?

I think I need some help figuring out how to ask Cura to only run the fan at 0% or 100% and nothing in between. (I'll explain later why)

I have set the Fan speed min (%) to 100 which I think should tell Cura that if ANY amount of cooling is needed then the fan should be turned on ala M106 255.

I set the Fan speed max(%) to 100, just for good measure.

But when I look at the gCode I am seeing places where the fans are being turned on at slower values such as:


M106 S84



M106 S168


Is there another setting I have over looked?


The reason why I want to do this is that I am running an UMO and I believe the PWM used for fan speeds<100% is causing major trouble with my temp sensor and causing failed prints. When the fan speed is anything other than 0% or 100% I am seeing immediate jumps of 5-10 degrees in the temp sensor. (see video)



and reading this thread lead me to test out the impact of fan speeds.



I have ruled out shorts in the wire (I am on my 2nd cables already) and testing fan speeds can duplicate this issue for me. I have tried twisting my fan cables and move them over 20mm from the temp wires, but still see this behavior.



  • Link to post
    Share on other sites

    Posted · is the Fan Speed Min setting ignored in CURA?

    The problem comes with the 'Fan full on at height' parameter which makes that the fan will go from zero to max gradually until this height is reached.

    To achieve what you want, just disable the fan in the advanced tab, and use the TweakAtZ plugin to turn it on when you need it.


  • Link to post
    Share on other sites

    Posted · is the Fan Speed Min setting ignored in CURA?

    @nallath - looks like you missed the fact that the temp is fine when the fan is at 100% or zero. The temp only has issues when the fan is between these values.

    @amedee - thanks, your suggestion did not work since diableing the fan seems to over ride tweak at height, but it got me on the right track!

    What you need to do is set:

    Fan full on at height (mm) = Initial layer thickness (mm) + Layer height (mm)


  • 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

      • UltiMaker Cura 5.7 stable released
        Cura 5.7 is here and it brings a handy new workflow improvement when using Thingiverse and Cura together, as well as additional capabilities for Method series printers, and a powerful way of sharing print settings using new printer-agnostic project files! Read on to find out about all of these improvements and more. 
          • Like
        • 16 replies
      • S-Line Firmware 8.3.0 was released Nov. 20th on the "Latest" firmware branch.
        (Sorry, was out of office when this released)

        This update is for...
        All UltiMaker S series  
        New features
        Temperature status. During print preparation, the temperatures of the print cores and build plate will be shown on the display. This gives a better indication of the progress and remaining wait time. Save log files in paused state. It is now possible to save the printer's log files to USB if the currently active print job is paused. Previously, the Dump logs to USB option was only enabled if the printer was in idle state. Confirm print removal via Digital Factory. If the printer is connected to the Digital Factory, it is now possible to confirm the removal of a previous print job via the Digital Factory interface. This is useful in situations where the build plate is clear, but the operator forgot to select Confirm removal on the printer’s display. Visit this page for more information about this feature.
          • Like
        • 0 replies
    • Create New...