Stackable Raspberry Pi Rack

This is a "plate" that you can mount a raspberry pi 2 / 3 to, add some _M3 x 25mm+6mm Male to Female Standoffs_ and another plate and stack them until you run out of raspberry pi's, or hit the ceiling. There is a space for an optional cooling fan.

Additional parts needed:

I toyed with printing these, but they just were not as sturdy as I wanted them to be. The posts were fine, but being able to stack them required additional hardware, or a small printed peg, that just didn't hold up to wha