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-WOOD Spool3D Dark Brown Transmission Distance: 2.5
PLA-WOOD Spool3D Light Brown Transmission Distance: 3
PLA Jayo White Transmission Distance: 6.3

Start with Black
At layer #10 (0.88mm) swap to Dark Brown
At layer #13 (1.12mm) swap to Light Brown
At layer #18 (1.52mm) swap to White for the rest.

Model can be scaled up just do not change the Z. I left it small so that the slicing time would not exceed Bambu limits.