This is a remix of ctheroux's excellent Orange Pi 3 LTS Case, which I really liked but thought could use a little flavor. I changed the size of the fan to 40mm to fit the fans I had on hand, and rounded off the edges and added a cute orange design to the fan shroud.

I used these fans here:

https://www.amazon.com/dp/B07CH6YC32

As well as 4 12mm M3 screws and 4 hex nuts for mounting. You'll want to connect the fan to the 5v and ground pins of the GPIO Out, which are the two pins on the right side, one from the top, diagram is here:

http://www.orangepi.org/img/computersAndMmicrocontrollers/3%20LTS/Rectangle%20741.png

If you used the fan in my amazon link, the fan connector should just slide on with no issue.