2 0.48 walls, 0.2 layer height, default Anet A8 speeds, 70mms/50%outer/80%infill, 20% infill, 5 top 5 bottom.
I used supports and sank the ocarine a little (about 1mm) into the bed to have a little plain face to have good first layer adhesion.
The fun part is it was just unplug and play :) with a hand gesture i removed it from bed and supports and the next thing i was doing was playing my first notes.
About the keying... i discovered is similar to straight typical flute but with one more hole in both faces. So if you put it vertical you can un-tap your fingers in order to play the scale.