A Raspberry Pi 2/3 stackable cluster case.
These base pieces are compatible with my Orange Pi Zero cluster case (https://www.thingiverse.com/thing:2994496) and the two can be stacked together. Note that it is NOT compatible with my orange pi one cluster case.
There are two included STL models. The first model is the base (rpi3_cluster.STL) and the second (rpi3_cluster_top) is the optional top piece that sits on the highest base piece. It is an optional part but makes the whole cluster look much nicer. You can stack as many of these on top of each other as you would like but it may become unstable if you go too high so use your best judgment ;).
If you print one and like it, please let me know by clicking "I made one." I would love to see your RPI cluster! Thanks and enjoy!