Filament-proof fan cover, 40mm

Hi! I designed this fan cover because I got some filament into my Anet A8's fan, instantly breaking a blade.. Because I didn't want this to happen again, I made this cover. Because of the 90 degree angles between the wavy bits, it is very hard for something to slip through accidentally.

This model should work for most 40mm fans.

I've also uploaded the Solidworks model, if you want to adjust something.