UPDATED VERSION [ New version has larger side vents and bigger recesses for adapter-to-motor bolts ]

This is for the BIqu H2 extruder. The extruder motor can get hot under certain circumstances - incorrect retraction settings or very high flow rates (ie high flow nozzle). This uses a 30mm fan (pulled from an E3D V6) and directs air against the extruder motor with more than enough airflow to cool it. Plus, it looks pretty sweet as well ;)

Instructions: Two 3mm bolts (diagonal from each other) hold the adapter to the motor, and the other two hold the fan to the adapter.