A new case for your raspberry pi 2 and 3. Slide in style. 40mm x 40mm x 10mm fan built in. Make sure you install fan first, then plug it into pi before installing the pi, otherwise you wont be able to access pins after the install. Can be stood up on MicroSD card end or laid down on its side. Add some bumpons for some grip.
Qty 1 40mm x 40mm x 10mm fan
Qty 4 #4 x .375 sheet metal screws - flathead
I have printed 3 of them already. The files are good and tested. If your machine runs small you will want to scale this up another 1 or 2%