Jump to content
UltiMaker Community of 3D Printing Experts

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 5.3 stable released
        In this stable release, Cura 5.3 achieves yet another huge leap forward in 3D printing thanks to material interlocking! As well as introducing an expanded recommended print settings menu and lots of print quality improvements. Not to mention, a whole bunch of new printer profiles for non-UltiMaker printers!
          • Thanks
          • Like
        • 24 replies
      • Here it is. The new UltiMaker S7
        The UltiMaker S7 is built on the success of the UltiMaker S5 and its design decisions were heavily based on feedback from customers.
        So what’s new?
        The obvious change is the S7’s height. It now includes an integrated Air Manager. This filters the exhaust air of every print and also improves build temperature stability. To further enclose the build chamber the S7 only has one magnetically latched door.
        The build stack has also been completely redesigned. A PEI-coated flexible steel build plate makes a big difference to productivity. Not only do you not need tools to pop a printed part off. But we also don’t recommend using or adhesion structures for UltiMaker materials (except PC, because...it’s PC). Along with that, 4 pins and 25 magnets make it easy to replace the flex plate perfectly – even with one hand.
        The re-engineered print head has an inductive sensor which reduces noise when probing the build plate. This effectively makes it much harder to not achieve a perfect first layer, improving overall print success. We also reversed the front fan direction (fewer plastic hairs, less maintenance), made the print core door magnets stronger, and add a sensor that helps avoid flooding.

        The UltiMaker S7 also includes quality of life improvements:
        Reliable bed tilt compensation (no more thumbscrews) 2.4 and 5 GHz Wi-Fi A 1080p camera (mounted higher for a better view) Compatibility with 280+ Marketplace materials Compatibility with S5 project files (no reslicing needed) And a whole lot more  
        Curious to see the S7 in action?
        We’re hosting a free tech demo on February 7.
        It will be live and you can ask any questions to our CTO, Miguel Calvo.
        Register here for the Webinar
          • Like
        • 18 replies
      • UltiMaker Cura Alpha 🎄 Tree Support Spotlight 🎄
        Are you a fan of tree support, but dislike the removal process and the amount of filament it uses? Then we would like to invite you to try this special release of UltiMaker Cura. Brought to you by our special community contributor @thomasrahm
        We generated a special version of Cura 5.2 called 5.3.0 Alpha + Xmas. The only changes we introduced compared to UltiMaker Cura 5.2.1 are those which are needed for the new supports. So keep in mind, this is not a sneak peek for Cura 5.3 (there are some really cool new features coming up) but a spotlight release highlighting this new version of tree supports.  
          • Like
        • 22 replies
    • Create New...