If you're going to make a fan cover, why not do it with some style.
The V8 scoop part, airfilter and cover were remixed from DarkDragons V8 engine (search for V8 engine on thingy DDW) modified the base and innards and added a lever (as the original is servo driven)
Pretty simple to print, screws required are M1.2 x 4mm
4 x required for front cover, 2 needed for optional back air filter.
All can be printed without supports, bridging is gradual so no need to up the speeds.