Organic Fan Guard 90mm
thingiverse
I designed this for the exhaust of my mainboard cooling fan, which is a 90mm unit, and it perfectly matches the shape of a Delta 90mm fan. As such, it will fit any 90mm (or 92mm) fan seamlessly. The thickness of the design forces air to exit straight out, rather than blowing out at the outer edge of the fan. This eliminates any potential noise-causing features near the fan blade and ensures that airflow is not restricted in any way. I've also included a link to my 40mm Organic Fan Guard for reference: https://www.thingiverse.com/thing:3160832 Here's a screenshot of how I printed them without supports using Cura, if needed.
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