Listen.

Sometimes the kids get told and told, and literally, the moment they (hopefully) flush, their memory is wiped. They're gonna miss out on whatever is happening outside the bathroom all the sudden.

This. I've had it up for 2 days as a test, and its already working. Heck, its reminded me just as often when I'm in a hurry. It's a marvel what can happen when there's just a little visual cue.

I highly recommend it.

It's a 4 color print, which again, you're totally capable of doing with or without an AMS system. It's a 4.5 hour print or so, and measures 6 inches tall (~160mm).

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

Filaments Used:
PLA BambuLab Basic Black Transmission Distance: 0.6
PLA BambuLab Basic Pink Transmission Distance: 8
PLA BambuLab Basic Yellow Transmission Distance: 4
PLA Default White Transmission Distance: 5

Swap Instructions:
Start with Black
At layer #9 (0.8mm) swap to Pink
At layer #23 (1.92mm) swap to Yellow
At layer #26 (2.16mm) swap to White for the rest.