bugfix_1.1.x] E0 auto fan doesn't activate on MKS GEN 1.4 · Issue #12597 · MarlinFirmware/Marlin · GitHub
![RAMBO board problem with extruder fan & part cooling fan · Issue #11804 · MarlinFirmware/Marlin · GitHub RAMBO board problem with extruder fan & part cooling fan · Issue #11804 · MarlinFirmware/Marlin · GitHub](https://user-images.githubusercontent.com/13849841/45925830-9936ca00-bf25-11e8-99c6-5d38fb8d2b19.jpg)
RAMBO board problem with extruder fan & part cooling fan · Issue #11804 · MarlinFirmware/Marlin · GitHub
![ramps 1.4 - How to configure Marlin to enable auto-fans with dual extruder - 3D Printing Stack Exchange ramps 1.4 - How to configure Marlin to enable auto-fans with dual extruder - 3D Printing Stack Exchange](https://i.stack.imgur.com/X7gcS.png)
ramps 1.4 - How to configure Marlin to enable auto-fans with dual extruder - 3D Printing Stack Exchange
![ramps 1.4 - How to configure Marlin to enable auto-fans with dual extruder - 3D Printing Stack Exchange ramps 1.4 - How to configure Marlin to enable auto-fans with dual extruder - 3D Printing Stack Exchange](https://i.stack.imgur.com/eudic.jpg)