In the latest version of marlin (1.1.8), I set the E0_AUTO_FAN_PIN to 44 and FAN_PIN to 9. I tried to reduce the fan speed for the extruder by setting EXTRUDER_AUTO_FAN_SPEED, but the PWM caused some noticeable noise. To reduce such noise, FAST_PWM_FAN was defined. However, it seems the FAN_PIN is affected by FAST_PWM_FAN but not the E0_AUTO_FAN_PIN. Is there a way to set a faster PWM on an extruder fan pin?
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