Honeycomb pattern for ventilation.

Use M4 nuts and bolts to secure top and bottom together. Slot in the nuts in the slots on the side, sandwich the OrangePi board in the middle, and secure with screws.

I printed mine with PLA+ (Jayo) on Ender 3 S1.

Organic supports recommended when printing the top part to get better slot for the nuts.

For Orange Pi 4 LTS