Maintenance dust cover for Prusa MK3 print fan bearing

I suppose that everyone will be faced by the annoying rattling noise of the print fan.
This happens while full rpm at startup or during the print, when full cooling is neccessary.

I solved this problem by applying ONE small drop of particular oil (KLÜBER GLY 2100) to the bearing. This bearing can be accessed, when the fan is removed and the PRUSA label is peeled off.  

But: The label will not stick very well a second time. 

To protect the bearing against dust, I designed  a dust cover for the print fan. It simply is pushed into the hole.