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Fan speed controls

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Posted · Fan speed controls

Hello community,


I have a question - What are the settings that control/affect the Fan speed in Cura?


I have started a topic about the "Bridge fan speed" to which I don't have an answer and now I see that the fan speed for other projects I'm doing is not what I specify.


Apparently there are some settings that are not stright forward visible or some Material, Shell or Other settings that affect the Fan speed.




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    Posted · Fan speed controls

    Can you explain more about the fan speed?  You could be referring to many things I know of or something I don't know about.  I guess the first thing I can think of:


    Typically the fan is off on the first layer and then increases slowly until around the 5th layer.  Maybe this is what you refer to?


    If not then please be more specific - exactly what fan speed did you expect and why.  And what fan speed did you get on the printer?  Also some printers show it as a percentage from 0 to 100.  Other printers show it as a number from 0 to 255 (where 255=100%).  The gcode uses 0 to 255 I think.


    In cura, you can enter "fan" in the settings search and it will show all (I think that's all of them) relevant settings (it won't show settings that aren't used for example if you disable support then it won't show any fan settings related to support - if there are any).


    Note also that there are special fan settings features related to bridging.  Particularly, the @burtoogle version (aka smartavionics) of Cura has some outstanding features for bridging.  Some of them got pulled into recent versions of Cura but some I think are only in his version here:



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    Posted · Fan speed controls

    Thank you for your reply gr5,


    To my last project I've noticed what you describe - on the raft and initial three layers the fan speed was 0 rpm (in Cura I specify in % of the max fan speed - 255 rpm). After that it goes to the specified - in the case 80%.


    On my other project with bridging the fan speed changes like this:

    - initial layer - 0 rpm; specified 80%

    - second layer - 128 rpm (50%); specified 80%

    - third layer - 204 rpm (80% as specified)

    - first layer of bridging - as specified 80% for the none hanging part and 99% as specified in the Experimental settings>Bridging




    - second layer of bridging - as specified 80% for the none hanging part and 0% of the hanging.


    - third and forth layer of bridging - same as the second one


    - fifth layer of bridging is all at 80% as specified.



    And after following your advice to write "FAN" in the search bar, I found the reason for all the above - hidden settings for me 🙂




    Attached are pictures for all the points.


    Thanks for the help gr5.














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