Three Color Lithopane

To give out as gifts one year, I made some lithopanes of friends and their families. These thin reliefs of sort, when back-lit reveal a photographic image. I used this site Image to Lithopane to generate the print file from a picture - default settings Flat 100 x 100 x 3mm.
As an experiment to make more interesting when not back lit, they were printed with a three-tone scheme. I selected a trio of complementary light, mid, and dark filament and swapped during print.
I've included an .stl for the stand which holds a 3mm lithopane, the default setting from the site above, perfect for placing on a window sill.