I'm deducting a star because removing the protective material from the acrylic dog bones was just a hassle, but I guess it's up to me and nowhere to place a small fan for each PI. Be flexible with the number of installed PIs. I only use three which gave me the option to put an SSD underneath for storage. I also have room at the top for another PI if I want to expand. I could have left a few tiers and used a small form factor, but the stack itself looks pretty impressive.
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