I have test printed this but forgot to take a picture of the completed print. I am including directions on how to print if you do not have a mmu/ams.

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

Filaments Used:
PETG JAYO Black Transmission Distance: 0.3
PETG GEETECH Gray Transmission Distance: 3
PETG JAYO White Transmission Distance: 6

Swap Instructions:
Start with Black
At layer #8 (0.72mm) swap to Gray
At layer #15 (1.28mm) swap to White for the rest.