I was able to slice and print this at Print ends up at about 200x201.8x1.97, almost 8"x8", but I was unable to upload because of it's size. So i reduced this to 150x150x1.97

Feel free to scale to your liking just make sure to disable "Uniform scale" when doing so. The Z must remain the same height otherwise it will not blend properly. Clearly an AMS makes this easier but it is not required, just places pauses and be ready to swap filament.

Picture of my filament colors for reference.

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

Filaments Used:
PLA BambuLab Basic Black Transmission Distance: 0.6
PLA+ Esun Brown Transmission Distance: 1.5
PLA BambuLab Basic Orange Transmission Distance: 10
PLA BambuLab Basic Jade White Transmission Distance: 5

Swap Instructions:
Start with Black
At layer #10 (0.88mm) swap to Brown
At layer #15 (1.28mm) swap to Orange
At layer #19 (1.6mm) swap to Jade White for the rest.