This is a brief tutorial on how to add additional fans beyond the normal two fans.

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Hardware:

MKS Gen L v1.0
Fan Extender Expansion Module
Jumper wires
Stepper board and NEMA 17 motor
12 volt power supply
USB cable

Software:
Arduino IDE (1.8.7 or higher)
Marlin Firmware 1.1.8 or higher
Pronterface.exe