Remixed my LED Bulb Single Lithophane stand (https://www.thingiverse.com/thing:3292458) and swapped out the bulb holder for a USB extension cable slot. I need to clean up some of the model edges but I printed it and it is working fine.

Intended for use with USB thumb LED arrays similar to:
https://www.amazon.com/gp/product/B01N5MPJ46/

These thumb arrays seem to be much more cost effective than other sources I've found so far. Thread a USB extension cable through the top of the holder, insert the USB array, done!

Monoprice

Maker Select

No

No

0.2mm

20%

Works with a variety of lithophane sizes. Using 130mm x 130mm x 3mm in the example.