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UPDATED V2 has thicker outer shell walls and included is a version with a small cutout at the body mating to allow wires to exit based on the airflow direction. Fill the hole with hot glue after routing wires.

A small desktop bladeless multiplier shroud for a 30mm brushless EDF available from many online retailers and advertised as over 100,000 rpm operation.

https://www.aliexpress.com/item/1005006841221896.html?spm=a2g0o.order_list.order_list_main.53.a5b11802l5HjkR

It uses 2x M4 bolts, brass inserts and the above described fan.

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