Allegedly, the btt skr e3 mini v3 puts out 24V at 100% fan speed but only 12V if fan speed is set to 50%,if its true then it opens up alot of new possibilites for choosing fans and i have 2 questions regarding this.
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parts cooling, one easy way to set the fan to 50% is just to do it in the slicer but its only a matter of time until its set to 100%.
Is there any way to configure klipper to run the fan at half the value set in the slicer?
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hotend cooling fan, is there any way in klipper to set fan speed to 50% or is it only an on/off option?
It still outputs 24 V, but it is 50% pulsed so that the average voltage is 12 V.
As you said: Usually you can set the maximum part blower fan speed in the slicer. If it gets to 100% there are reasons. If it is too loud: See below.
To 2. :
Always use the maximum speed for the hotend/heatbreak cooler fan to avoid heat creep and resulting clogs in the hotend. It it is too lot you may use a silent fan and/or a different air flow geometry. If you have a fan cover, a different one can be less noisy too.
In all: Proper cooling is essential for good prints.
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