UPDATE: Template v2 - the hole for drilling the fan fits better than shown in the photo
Qidi recently introduced additional extruder cooling (link below)
This is a template for cutting a hole for better fan airflow. It also includes a decorative ring that covers and, after gluing it, strengthens the side of the original cover after cutting the hole.
I recommend a decorative ring material with higher temperature resistance. Of course, the template material does not matter.
The author marked this model as their own original creation.