This is a patch for the EINSY Case for Prusa i3 MK3 - Raspberry PI Zero W slot.
If you don't use your RPi, or you upgraded to a full size model and you don't want to have a hole in your EINSY case, then all you gotta do is to download this model and print it!
When you insert the patch into the case, make sure that the Longer snappers or teeth are inserted first in the position shown on the picture below. Once that is done, just push the short teeth into place. Easy!