I went on https://3dp.rocks/lithophane/ and made my flat lithophanes 150mm squares and 3mm thick with 5mm borders.
I used a “hanging pendant light cord” but it isn't listed on amazon anymore. As far as I can tell this 2 pack is exactly like what I used. https://a.co/d/4q9DI6c
To assemble, you superglue the bottom of the box into the slot on each of the legs. Clamp the socket of your bulb. Then you slide your lithophanes in. Screw in the light bulb. Lastly you glue the top piece and your final lithophane.
Printed with black PLA + from Elegoo for the box and white for the lithophanes. (The lithophanes come out the best with white.)
.4mm nozzle/.2mm layers
200C/60C temps
The author marked this model as their own original creation.