Raspberry Pi Case w/Fan Spacer and Breadboard

Adding a fan to a Raspberry Pi is not required, unless you are overclocking, but I had the fan from a previous project. I had made a spacer for the case lid, see https://www.thingiverse.com/thing:2897483 giving enough height if you were using a heat sink. Powering the fan from GPIO pins means the fan runs continuously, which could be annoying (my fan is very quiet), but I'm always looking to improve my projects.

I came across this Instructable: https://www.instructables.com/id/Control-a-Cooli