How to tune Stall Detection?
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I followed your instructions and it is working perfectly fine. I used a three pin molex, one of the side pins is connected from the 24V pin to the buck converter VIN, the middle pin pin goes from the Vfan to the VCC output of the buck. Unfortunately this jumper is not protected against reverse polarity, so I will have to label it very carefully. Worst case (reversed polarity), I would power the buck converter with 5V and nothing serious will happen.
You saved my Noctua and my radial fan!. I love my Duet more and more, it has plenty of possibilities for any configuration. Very versatile.
Thanks again for you great help.