1, Light Box with all the hard has been done, adding diffuser and cutters.

2, Cutters are digital cutters, don't print, just use the files to cut A from B, then your picture or lithophane fits perfectly into the rebate of the box.

3, I used PETG as an interface on the legs of the box, and it worked great, just delete the prime tower and add 300 to 400 purge (set material plate temp to 34oC)

4, Diffuser, use clear PETG, works great and no supports

5, double double check all your settings.