The .3mf file is preconfigured but here is the color changes:

Print at 100% infill with a layer height of 0.08mm with a base layer of 0.12mm

Filaments Used:
PLA Smartfil Black Transmission Distance: 1.2
PLA Smart RE Red Transmission Distance: 5
PLA Smart RE Yellow Transmission Distance: 5
PLA Smartfil White Transmission Distance: 5

Swap Instructions:
Start with Black
At layer #5 (0.44mm) swap to Red
At layer #11 (0.92mm) swap to Yellow
At layer #18 (1.48mm) swap to White for the rest.