There are normally two extruder fans
1) the part cooling fan. This is the fan controlled by M106/M107 used to cool the part as it is being printed. This is on FAN_PIN (FAN0_PIN in newer marlin)
2) the hotend fan. This is set with E0_AUTO_FAN_PIN, eg #define E0_AUTO_FAN_PIN FAN1_PIN It cannot be set to FAN_PIN (or FAN0_PIN) This is not controllable with M106/M107
This turns on when hotend temperature exceeds the set temperature eg #define EXTRUDER_AUTO_FAN_TEMPERATURE 50
Edited 2 time(s). Last edit at 08/15/2023 02:04PM by Dust.