This is the original Ender 3 Extruder Fan Cover. Doesn't really work printed in plastic as it's too flimsy. Including SketchUp file for your mods.
I printed this in PLA but you won't want to print this as-is in plastic, as it will be too flimsy. I plan on adding some supports because I do in fact need a plastic cover due to using magnets in my prints, but I thought some people might want the original unmodified fan cover. It's basically Creality's file from github but I added the appropriate metric threads, as the github object didn't have them.
For the modified version with supports for printing in plastic see this printable:
https://www.printables.com/model/245498-ender-3-extruder-fan-cover-mods-for-printing-in-pl
The author hasn't provided the model origin yet.