That is a great mod, I have quite a few noctua fans in my unifi equipment and those adapters would be perfect. Any chance I could get the file?I realize it's an old thread, but I thought some of you might like this mod to silence the fans:
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I 3D printed a 40mm to 30mm fan adapter and used Noctua fans. Temps are about the same, noise is like 1/2. You do have to loosen the screws holding the fan adapters before closing the switch, as the top of the case gets in the way. Simply tighten them once the case is closed.