I created this light shade holder for my bedroom light because the bulb was a bit strong when it was in my eyesight.

I first created lithophane with this site: https://tool.itslitho.com/CreateModel

In my case, I printed it 1,96 mm thick and that is what these holders are for. Otherwise, the lithophane on the picture is 200 mm in diameter. Don't forget you cannot print it lying flat, it has to be printed standing up on the bed to get the best quality. Print can be very unstable with moving bed, so you should use some supports - not slicer supports, but something like this: https://www.thingiverse.com/thing:4729811

For better temp resistance, print it from PETG, ABS or something ;-)