Generic Raspberry Pi Rack

This is just another server rack for up to 8 Raspberry Pis.

You will need the following hardware:
- 4x aluminum tube (length 125mm, outer diameter 5.5mm, inner diameter 4mm)
- 4x threaded rod M4 (length 145mm)
- 8x washer M4
- 8x nuts M4
- spacers and screws for mounting the Pis to the mounting layer (4 pcs per Pi)

Print one wall left & right each.
Print 4 Layers and 4 Fan Mounts.
Print Markers in different colors for identifying your Raspberries in the rack.
You can place one or two Raspberries per layer. When placing two Pis next to each other, the USB port of the right one is not accessible, so it must be powered via the GPIO pins.
Use a 120mm Fan.