I designed from scratch this case because I wanted a case o most compact possible (to save filament when printing and to carry easily).
After 3 iterations, and a lot of measures with a digital caliper I design the smallest case on the Thingiverse.

MAIN FEATURES

• Very compact (its the smallest case possible only 49x52x34 mm)
• Well vented from all the sides
• Antenna position interchangeable (but you can also choose to keep the antenna inside the case)
• LEDs windows
• Squared box that can be used in different orientations
• Reinforced mount poles (with ribs when possible)

What do you need:

• 2 small M3 screws (M3x5 - button head)
• 4 M3 bolts (flat head with at least 8mm, I used this excellent black bolts from Aliexpress M3x12)
• M3 tap (highly recommended to open threads)

When you should choose another case

• You don't have a properly calibrated printer that cannot print with precision small holes and 1.2 mm walls (This is a complicated object to be printed)
• You don't like tight fits. The placement of the objects is critical, and you have a little margin to play
• You need a small fan or a big heatsink (I used a small aluminum heatsink and because I will not perform very CPU intensive tasks I don't need to worry a lot about cooling)
• You need a stronger/robust case (I used 1,2 mm walls so it's not the toughest cases)
• You don't have the Orange Pi extension board
• You need to use the GPIOs pins or the serial monitor pins
• You need a big IR window for the side sensor