Raspberry Pi 4 Case 40mm Fan

The new Raspberry Pi 4 consumes draws more power and generates more heat than before. But the official Pi4 case does not come with a cooling fan nor vents for ventilation.
This results in thermal throttling after a few minutes of moderate workload.

I have analysed thermal images of Pi4s under load.
With the relevant information in hand, I made a decent case with 40mm fans to help alleviate the problem.

NOTE:
A heatsink is beneficial.
But use one of max height 5mm.
Slightly taller heatsinks may fit, but not guaranteed.


IMPORTANT:
1. Use support blocker on Cura along the vent holes at the back, "Raspberry Pi 4" lettering and Raspberry logo.
2. The ports section of the case is recessed 1mm to allow access to the HDMI and USB-C ports. This section "might" need supports. Check preview on Cura.
3. Use 4Gx6mm (x4) screws to mount Pi 4 to case bottom piece.
4. Use M3 bolts and nuts to mount 40mm fan to case top.
5. Use 4Gx6mm (x4) screws to mount case top to case botto