This is my Design for a Fan Guard for the Prusa Blower Fan (5015 Blower Fan).

To make it work you have to seperate the file in the slicer and edit the inner model.

Change the Settings for the inner disk like so:

0 Parameters

0 Top Layers

0 Bottom Layer

20-25% Infill

0.16 mm Layer Hight

Hope this helps some people out there :)