I am using a Raspberry Pi 3b + with the official 7" TouchScreen and case as a screen for a surveillance camera.
It was running very hot, and i got warnings on screen for high temperature.

Designed a new back lid for the TouchScreen case with fan and vent holes.

I have versions for 3 different fans:
30mm (i used 30x7,5mm, but 30x10mm should also work fine)
40x10mm
40x15mm

All versions come with either screw holes for mounting the fan, and a alternate version if you have a finely tuned printer where the fan should press into place and no screws needed.

Pictures are of my first version wich is too thin and flimsy. The version published here is much nicer.

20.12.2022 - Updated all files. The top clips were a bit too wide.

Doesn't Matter

No

0.2

15%

I printed mine in ABS, but type of filament should not matter.