Cooling fan mount for Raspberry Pi 3B+
Description
I use a Raspberry Pi 3B+ for Octoprint to drive my Marlin-controlled printer. The Pi sometimes overheats when I recompile Marlin, so I needed to add a cooling fan. Since the Pi is inside the printer controller enclosure, I didn't want to make a case for it. This Thing provides a minimal frame to mount a 30mm cooling fan. I use a 5V fan that connects to the Pi 5V and GND pins. I've also added a base, so the Pi is no longer just lying on the shelf. The mount holes in Raspberry Pi 3B+ are 2.75mm and a M3 screw will thread through them without a need for a nut. I've made the mount holes in frame and base the same diameter. Depending on your print quality, you might have to clean them using something like 7/64", or 2.75mm drill bit. Base is not necessary, you can mount the frame by itself to the Pi. The 5V fan I used produces very little airflow, but the Pi hasn't overheated since. A stronger 12V 30mm fan will fit on the frame, but you'll have to provide a separate 12V power source for it.
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