I generated the lithophane from a family photograph using 3dp.rocks, making sure to use its positive-image setting so the picture would read correctly when illuminated. I then brought the model into Blender and replaced its border with a thinner one sized to fit the slots that had originally held the shadow-box glass.
The panel was printed flat in white Elegoo ABS-Like resin with extra exposure on the initial layers. Printing took about twenty minutes. Afterward, I let the build plate cool before carefully lifting one corner; the resin had enough flexibility to peel away without damaging the print.
I cured it for four minutes, flipped it, and cured it for another three, a longer cycle than I normally use, intended to produce a warmer tone. The finished panel replaced the glass in a shadow box that I took apart and reassembled around it. A small LED strip sits around the inside perimeter, as far behind the lithophane as possible, to light the image evenly.