Wanted to make a set of small raspberry pi cluster modules of at least 4 raspberry pi's maybe more, but extensible.

Did not really like any of the ones out there when I looked that were either just spacers and assumed vertical packing, or assumed a fixed number of nodes. Wanted something where I could just add more horizontally, with the raspberry pi basically on edge, one by one.

So finally designed this. The joiners give a snug fit. A number of features were added for either fixing down with M3 screws or cable ties including tieing cables along the top of the frame.

You can download the Fusion360 model here: http://a360.co/29GNrZ1