This is my own design for a lithophane light box / frame, I also print a very thin white reflector so the light bounces off the back, it will hold 120mm x 90mm finished pictures / lithophanes
These are the sockets I used https://www.ebay.co.uk/itm/Pair-5-5mm-X-2-1mm-12v-DC-Power-Jack-Plug-Round-Panel-Socket-CCTV-LED-C507-A203/162609816040?ssPageName=STRK%3AMEBIDX%3AIT&var=461611799327&_trksid=p2060353.m2749.l2649
These are the leds https://www.ebay.co.uk/itm/led-strip-2835-5050-DC12V-waterproof-flexible-tape-light-60leds-m-rope-stripe-5m/301851895453?ssPageName=STRK%3AMEBIDX%3AIT&var=600663836193&_trksid=p2060353.m2749.l2649
I use a standard 12v DC 220v AC power adapter with a positive centre pin
I can be found here if anyone fancys a chat or needs any help to create a lithophane https://discord.gg/R8f7vJ3
Ive added two more frames to this project that have a bit more shape and slightly bigger,
print them with support set to touching the build plate, It worked well for me and the support came away easily.
8 - 10% Infill