Just made this for a christmas present with a picture, and it seems to be working fine.
The round holder is for a standard tea candle ( i used a LED tea candle as it wouldn't burn the litophane) :-)
These dimensions is MY OWN settings for my litophane picture, you might change it if you like :-)
x: 120mm (as the space is 120mm, do this at your own risk! :-) )
y:Up to you but 160,8mm has shown me the best result heightwise!
z: 2,4mm was mine and it worked fine!
Happy Printing! And happy holidays!
3DE Glow in the Dark 1.75 PLA