This is a case for the Duet WiFi 32 bit controller.
July 31 update:
New case lid file uploaded as mounting holes not correctly aligned.
It is designed to provide convection air flow when mounted vertically or can have a fan attached to provide forced air cooling.
The PCB mounts centrally with space on all sides for wiring. It provides for protection of the WiFi antenna whilst still allowing access to the SD card.
A cutout is provide so most USB cables should plug in,
The lid is optional and provides wire access cut outs.
I printed the first one with two perimeters and 20% infill but this is purely a suggestion and lower infills may well be fine.
This was designed in Fusion 360.
The fan adapter bolts on using M4 nuts and bolts.
If anyone wants to design their own the key numbers are
Mount hole centres 62mm
Mount hole size 4.2mm (M4)
Hole centre from bottom: 7mm
Slot opening: 12mm x 50mm