I finally found time to install this upgrade. Works really well.
I have an UMO+ with the 2.1.4 revision PCB so I used the experimental branch of the custom firmware builder. https://bultimaker.bulles.eu/experimental/
- Fan kickstart: 200 ms (krijgt 200ms het volledige vermogen)
- Fan minimum PWM: 70 (min Fan speed 70/255)
- Fast PWM: enable
- Hot-end fan: enable
- Invert first Extruder (0) direction: enable
The only minor problem I had was the green wire of the Fan that was to short to connect to the board, so I extended it (the yellow