Credits, first of all:
Light Guide Plate, Frame, Test Litophane (Labrador) were respectively created by BambuLab, Lithophane Makers and larissatondim (As said here)

• Why?
  I found litophanies amazing, but I never succedeed in all the steps at the first try. Here I'm trying to share my knowledge (after a lot of fails), sharing with you all my settings to succeed without struggling, starting from how to print the frame, to wich flush settings to use for the litophane itself.
  I included also the Light Guide Plate, wich is foundamental to a good result.
  
• Features:
  • Frame:
    • The Frame is oriented considering cooling fan; I lost a lot of frames (5h print ruined 30minutes before the end) beacuse first layers colded too fast, ruining adhesion of first layer, and later the frame detached from the plate.
    • Use COLD PLATE, to get as much as adhesion as possible.
    • Supports is setted as Tree Strong to use as less material as possible
    • Supports are positioned on the back of the frame, shielded from the air of the fans (see first point)
    • Bambu Lab logo removed
  • Light Guide Plate
    • Has walls settings recommended by Bambu Lab
    • Has fill settings recommended by BambuLab
  • Test Litophane (Doggo one)
    • A litophane of a beatuful Labrador, with all levels (CYMK) already setted
    • CYMK flush levels already optimized

I always wanted a complete kit to be easy, this is as easy as it can be, I hope you find this helpful

Fast Links:

Bambu Lab guide: link
Litophane Maker: link

If you want to know more, here the link to the BambuLab guide: https://wiki.bambulab.com/en/knowledge-sharing/CMYK-color-lithophane-printing-instructions