For the new ELEGOO Centauri Carbon 

Elegant solution for top glass riser that allows you to easily slide the glass backwards to vent the top.

Has a hole in the back corner for a LED light wire.

(check my other models for my new PTFE tube guide)

The cut up version should be glued together after printing.

The 1-piece version is for larger printers, or cut it up in your slicer the way you need to fit your print bed.