200 x 200, to resize, only modify X and Y axis, changing the Z axis will mess up the layer swaps. You can use your own custom color combination, just start with the darkest filaments first, and slowly transition to lighter filaments.

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

Filaments Used:
Black
Dark Purple
Dark Gray
Gray (or silver)
Off White (or beige)
White

Swap Instructions:
Start with Black
At layer #7 (0.64mm) swap to Dark Purple
At layer #9 (0.8mm) swap to Dark Gray
At layer #11 (0.96mm) swap to Gray
At layer #17 (1.44mm) swap to Off White
At layer #20 (1.68mm) swap to White for the rest.

Optional (Silk glossy white from layer #22)