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Thanks! Really loud! Requires some pressure to get going. Played around with the size. If anyone want to print one octave, I think this should work:
C 150,8%
C♯ 125,3%
D 118,2%
D♯ 111,6%
E 105,3%
F 99,4%
F♯ 93,8%
G 88,6%
G♯ 83,6% Choking hazard?
A 78,9% Choking hazard?
A♯ 74,5% Choking hazard!
B 70,3% Choking hazard!!
C 66,4% Choking hazard!!!

Note that the smallest ones constitute a choking hazard. I don't think kids should have any of these but be aware of the smallest ones! For your own safety put a cord through all of them.