This is a Raspberry Pi 3 B/B+ case that was built to allow a Noctua NF A4x20 5V fan to be installed internally.
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![[UPDATED] Raspberry Pi 3B/B+ Case with Noctua Fan 3D model preview](https://media.printables.com/media/prints/3914/images/300673_2b912598-9322-408c-874d-34f507b0cf49/card_preview_rpi_casewfangpiotop_v1.jpg)