Just practicing/learning to make lithophanes. Very cool.
Update: I've since learned that printing Lithophanes on their EDGE, vertically, is far far superior. The quality is so much better, that I no longer switch to my 0.25 nozzle, nor .04 layer thickness. I get fantastic lithophanes from my 0.4 nozzle and printing at 0.1 thickness. But, larger is better. Small details, esp dark ones, like EYES are still a challenge. My current lithophanes are usually 80x80. I got the vertical idea from www.thingiverse.com/thing:2718124.
Update2: Uploaded a vertical model with break-away stand.
Used my 0.25mm nozzle and my thinnest layer setting for the laying down model. But, for the vertical print with stand, 0.4 nozzle and 0.1mm layer work nicely.
Also very important to use 100% infill and choose a pattern that leaves absolutely no holes. I used "rectilinear/rectilinear" in S3D.
Small lithophanes are hard to print.