"First Mate"

If you like to scale, do it only with x and y axis, do not change z axis!
 

Print at 100% infill with a layer height of 0.08mm and a base layer of 0.16mm
Wallgenerator is set to “Arachne” for better results, if your CPU is slow, change it to "Classic"
For better results you can use a 0.2mm noozle, just leave all other settings as they are.

Filaments Used:
PETG BambuLab Basic Black Transmission Distance: 0.3
PETG BambuLab Basic Red Transmission Distance: 2.5
PETG BambuLab Basic Yellow Transmission Distance: 6
PETG BambuLab Basic Nature Transmission Distance: 8

Swap Instructions: if you don't have ams just put pause on specified layers and swap filament manually
Start with Black
At layer #15 (1.28mm) swap to Red
At layer #18 (1.52mm) swap to Yellow
At layer #20 (1.68mm) swap to Nature for the rest.

If you wanna use PLA:
PLA BambuLab Basic Black Transmission Distance: 0.6
PLA BambuLab Tough Vermillion Red Transmission Distance: 3.0 
PLA BambuLab Basic Yellow Transmission Distance: 6.0
PLA BambuLab Basic Beige Transmission Distance: 8.0

Just leave all other settings as they are.

I wish you always a clean nozzle