Geeetech

Thanks for the reply, but I’m still not clear what you’re saying?

1. So is it as simple as updating the stock firmware to enable PWM support?
2. It is a parts fan
3. OK, useful to know, but not what I’m doing
4. Understand, so do what? move to marlin 2 (I see you have) although the i3 pro a doesn’t ...

Did you resolve this? Ive fitted a three wire blower fan to the PWM socket and I have speed control from about 50% to 100% but it won't go off, anyone know how to fix this? is it the wrong type of fan? firmware? software? settings? I have the GT2560 board and an i3 pro A ali, much modified.