I had been running OctoPrint on my OrangePi zero almost non-stop for months. The previous enclosure I had the Zero in allowed for no airflow whatsoever and I was having issues with keeping the board cool during long prints.
I designed this case to allow airflow via vents as well as forced air by utilizing a 30x30mm cooling fan (which I had leftover from a part cooler upgrade on one of my printers).
4 Top and bottom layers with 15% infill and 2 outer perimeters
The case is designed to screw together with standard M3 screws. You'll need (4) M3x20 screws for the fan holder and (4) M3x8 screws for the clamshell.
The holes are sized appropriately for the M3 screws to self-tap and attach securely. Personally, I use a 1/8" (3mm) drill bit on the holes for the base plate so that the screws are free spinning and only thread into the body.
The fan I'm using is a 12v fan but will start and run off of the 5v rail on the OrangePi pinout.