Raspberry Pi 3 BB case with rack option
Free     Myminifactory     dargul

Raspberry Pi 3 (B/B+) case with rack option

Remix of 0110MPs design  I added the option to rack the casesHoles on Vesa mount are increased to 5mm You need to print top bottom if you want to rack Raspberries because of the increased Vesa holes ...

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Raspberry Pi 3 (B/B+) case with rack option alternatives