Of course you can buy it, and it is not so expensive. But it is so simple and you can make it by yourself.
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Step 1: Parts
Step 2: PCB Board and Schematic Diagram
Design printed circuit board (PCB), I was used ,,Sprint-Layout" software. Exported to Gerber files.
Step 3: Configuring Marlin Firmware
Fan to cool down the stepper drivers
This is for controlling a fan to cool down the stepper drivers
it will turn on when any driver is enabled and turn off after the set amount of seconds from last driver being disabled again
#define CONTROLLERFAN_PIN 5 //Pin used for the fan to cool controller (-1 to disable)
#define CONTROLLERFAN_SECS 60 //How many seconds, after all motors were disabled, the fan should run #define CONTROLLERFAN_SPEED 255 // == full speed
Extruder cooling fans
#define E0_AUTO_FAN_PIN 6
#define E1_AUTO_FAN_PIN -1
#define E2_AUTO_FAN_PIN -1
#define E3_AUTO_FAN_PIN -1
#define EXTRUDER_AUTO_FAN_TEMPERATURE 50
#define EXTRUDER_AUTO_FAN_SPEED 255 // == full speed