Round Edge-Lit Display (for Prusa XL 2H+)

This is a simple frame that fits around a 12" wide and 1/4" thick acrylic disk that you can buy online or make yourself. Adjust the model for other dimensions - F3D file included. A 10mm wide LED strip fits into the channel built into the frame, I used this one.

To print the frame, you'll need a large printer, ideally one that can do two materials - different for frame and supports.

In the slicer, disable automatic supports, and use paint-on supports in Smart Fill mode, just for the two overhanging surfaces as shown on this screenshot from below. The top of the LED strip channel doesn't need supports, and it would be very difficult to remove them from there. Use PETG for the frame and PLA for supports, set zero support distance, honeycomb pattern, and nonzero bottom interface layers - otherwise failures are likely.

The back sheet that you can see on the photos is just a printed 300mm wide 1mm thick cylinder, create it directly in the slicer - or use a piece of dark cardboard.

Once the LED strip and the acrylic sheet are inserted, secure the frame ends together with an M4x25 screw and nut (or just a zip tie).

Use an erasable white marker to draw on the display. Unfortunately, the acrylic sheet is easy to scratch when cleaning it, so maybe coat it with something or use a different material?..