This is a simple tutorial on how to connect and use an extruder extruder fan and heat bed.

Required Software:
Marlin firmware (version 1.1.9 or higher) (http://marlinfw.org)
Arduino IDE (version 1.8.5 or higher) (https://www.arduino.cc/en/Main/Software)
Pronterface (http://www.pronterface.com/)

Require Hardware:
1 MKS Gen L v1.0 motherboard
1 12V 0.06A Brushless DC Cooling Fan
2 Hotend Extruder for 0.4mm/1.75mm
1 heat bed