This is a cover for the Elegoo CC screen, that is designed to be used in conjunction with the screen accent by APDdesigns - https://www.printables.com/model/1213062-elegoo-centauri-carbon-screen-accent
It fits perfectly in the centre of the accent and has a very small lip on the inner edge to prevent it fully touching the screen and accidentally pressing buttons.
There is a plain version which you can add any designs or handles to (NOTE - I am working on one with a handle and would recommend adding something you can use to take it off, otherwise it is tricky to remove, you need to use your nails to pull it up by the edge.)
There's also my own version which has the radiation symbol as a bit of a joke but also functions as a handle. You need to print the symbol seperately unless you have a printer with AMS but it is designed to be printed in 2 parts.
I have printed mine on the Centauri Carbon in PLA using the standard settings.