READ FIRST You NEED a High Transparency white filament for this to work, MOST black and dark grays will work. Creality Hyper White is what I used for this, its very transparent and I havent been able to find one close to it.

Print at 100% infill with a layer height of 0.04mm with a base layer of 0.16mm

Filaments Used: PLA PolyTerra Charcoal Black Transmission Distance: 0.3 PLA Sunlu Meta Gray Transmission Distance: 2.8 PLA Creality Hyper White Transmission Distance: 12

Swap Instructions: Start with Charcoal Black At layer #17 (0.8mm) swap to Gray At layer #18 (0.84mm) swap to White for the rest.