"The filament used:

PLA BambuLab Basic Black Transmission Distance: 0.6

PLA BambuLab's basic infrared transmission distance: 4

PLA BambuLab Matte Lemon Yellow Transfer Distance: 4

PLA BambuLab has a strong milky white transmission distance of 10 meters. This photo uses four unique long filaments.

Exchange instructions:

It all started with black

Switch to red at layer #7 (0.64mm)

Change it to lemon yellow at the 12th layer (1.04mm)

At the 15th layer (1.28mm), replace the remaining part with a milky white one.