The fan base helps your LattePanda stay cool. After testing, my LattePanda stays about 10 degrees cooler.
I am currently using a 40mm x 40mm x 7mm 5V fan. You could probably use a 40mm x 40mm x 10mm fan. The correct fan size can be found on Ameridroid and Amazon.
The LattePanda is raised using 4 plastic standoffs and sits nicely in the base.
This may fit other single board computers.
For the fan base that is pictured, I just used the Touching Buildplate Support in Cura. To make the print quicker, I used a layer height of 0.2 and a wall thickness of 0.7.
The print only took a few hours with my Anet A6 printer.