I'm glad I stumbled across the C4Labs Zebra Bramble Cluster Fan Case as it offers more protection than other slim support frames while still being easily accessible and can be connected to all four SBCs. I've wanted to experiment with clustering for a long time, but haven't gotten around to it yet. The construction of the kit consists of rigid outer plastic panels and a similar inner frame, all held together with carefully spaced flanged nuts and bolts. Be careful not to over tighten as the plastic tabs will break. It comes with two small fans that attach to the back of the case. It's not that easy to assemble without instructions (included), but I managed it. The best cluster case I've ever bought.
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