Case for Raspberry Pi Zero 2 W that accommodates a 30mm fan, and holes for magnets that will attach the top to the bottom, and holes for magnets to attach the case to an external metal object.
The fan can be a 5v 30mm fan that runs fulltime by plugging to 5v/ground pins, or a 3-wire raspberry pi fan that plugs into 5v/gnd/gpio14. I used these: https://www.amazon.com/gp/product/B08G1M7GP9/
The magnets are 3x5mm magnets: https://www.amazon.com/gp/product/B0CCX7JPGH/
I used plain old superglue to attach the magnets.
The author marked this model as their own original creation.