100%infill 0 top wall 0 bottom walls 
initial  layer height 0.16 

layerheight 0.08 or 0.04
infill monotonic

filament Swap Instructions:

Start with Black

At layer #7 (0.64mm) swap to White

At layer #21 (1.76mm) swap to Sunflower Yellow

At layer #25 (2.08mm) swap to White for the rest.