Hexagonal 40mm fan shroud/grill
thingiverse
Most of the fan grills I found had the grill too close to the fan blades, which amplified noise, featured holes that were overly large or excessively flashy, so I decided to create my own. A few hexagons later, here's the result... The shroud extends 10mm from the face of the fan. This design is engineered to fit snugly into a 5.5-6mm diameter hole, even with a screw in place* One STL file has a chamfered face (chmf), while the other one doesn't. I would recommend using the chamfered version if you want the best results. *Your mileage may vary; a modified SW_2018 part is included for your convenience.
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