my setting

layer height 0.08mm

base layer 0.16mm

p wall 1

brim yes

on slicer: start with black, layer 12 to gray, layer 18 white.

Print at 100% infill with a layer height of 0.08mm with a base layer of 0.16mm

Filaments Used:
PLA BambuLab Matte Charcoal Transmission Distance: 0.6
PLA BambuLab Basic Gray Transmission Distance: 2
PLA BambuLab Matte Ivory White Transmission Distance: 4

Swap Instructions:
Start with Charcoal
At layer #12 (1.04mm) swap to Gray
At layer #18 (1.52mm) swap to Ivory White for the rest.