Abraham Lincoln Portrait by Alexander Gardner 1863 (HueForge)

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

Filaments Used:
PETG JAYO Black Transmission Distance: 0.3
PETG JAYO Gray Transmission Distance: 2.5
PETG GEETECH Gray Transmission Distance: 3
PETG JAYO White Transmission Distance: 6

Swap Instructions:
Start with Black
At layer #7 (0.64mm) swap to Gray
At layer #12 (1.04mm) swap to Gray
At layer #18 (1.52mm) swap to White for the rest.
 

Model is designed for a 200 mm print bed, but ive included a g code that should work for a prusa mini at .05 layer height with the color change points already encoded.