While there are quite a few covers here, i didnt like them very much, overly complicated, and not aesthetically pleasing.
My design is meant to be simple, quick and slim for minimal obtrusion. The slider is to be printed on its back, and the ring it meant to be printed with the "top" on the build surface to prevent supports.
Designed to be printed at 0.2mm layer heights, and tight tolerances. The clearances are 0.3mm all around. The Ring is meant to use 2mm adhesive tape commonly used for cell phone screen repairs as found in amazon.