Photo → stacked filament layers with colour-swap heights. Preview, then export STL / 3MF.
TD = transmission distance (mm): how thick a filament must be before it hides what's under it. Dark ≈ 0.5–1, light ≈ 2–6. Values here are typical; measure yours for best results. Usually order dark → light.
The 3MF carries the colour changes for Bambu Studio / OrcaSlicer. Check the layer preview in your slicer before printing, and print with the same layer height and base layers set here.