Stepstick coolingtunnel for K8200/3Drag

This is my stepstick coolingtunnel that I designed for K8200/3DRAG printers.
I designed it as I found that my stepsticks were running warm/hot during printing, even with heatsinks.
This cooling tunnel has the advantage over a direct fan, that it draws the air on the top and bottom of the stepstick boards, and ensures direct airflow across the heated areas.
The coolingtunnel is mounted with the boards top mounting screw.

Needed parts:
1x 30 mm x 30 mm fan, I use a 5 cufm version.
4x