Print at 100% infill with a layer height of 0.08mm with a base layer of 0.16mm,
Add pauses in your slicer at the layers below and swap colors: 

Swap Instructions:
Start with Polymaker Charcoal Black PLA
At layer #7 (0.64 mm), swap to Dark Silver PLA
At layer #12 (1.04 mm), swap to Inland Silver PLA
At layer #19 (1.60 mm), swap to Polymaker Cotton White PLA for the rest