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 5 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. Assign the 5th color manually, and double-book the black and white slot in Bambu Studio.

Filaments Used:
PLA BambuLab Basic Black Transmission Distance: 0.6
PLA BambuLab Basic Blue Transmission Distance: 4
PLA BambuLab Basic BambuLab Green Transmission Distance: 2
PLA BambuLab Basic Pink Transmission Distance: 8
PLA BambuLab Basic Jade White Transmission Distance: 5

Swap Instructions:
Start with Black [Once black is done, and its moved onto Blue, feel free to pull black out and put white instead, mid-print. It'll pull it in when its white's turn].
At layer #7 (0.64mm) swap to Blue
At layer #11 (0.96mm) swap to BambuLab Green
At layer #14 (1.2mm) swap to Pink [this can be substituted for Orange to get a very similar result]
At layer #23 (1.92mm) swap to Jade White for the rest.