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Failing Fan Calibration
My MK4S / MMU3 is failing the fan calibration test after doing a factory reset and installing the latest 6.4.0 firmware for MK4S. I installed a new Love Board thinking that was the problem. Checked the fan, it spins freely. I checked the connection and it was good. Then just to make sure it was not a broken fan, I swapped the connectors on the Love Board and the print fan worked but then the heatsink fan did not work. I checked the printer model in settings and it is MK4S. Any other ideas?
Napsal : 14/12/2025 2:34 am
RE: Failing Fan Calibration
Try reverting to 6.2.6. LOTS of people have reported problems with 6.4.0 especially on the MK4S/MMU.
MK4S/MMU3
Napsal : 14/12/2025 3:18 pm