It works, It works ! It is not easy to whistle first but starting slowly and trying doors closed it voices! I liked this ocarina, thank you for preparing these kind of instruments. Its voice looks alike flute. First 15 minutes I could not get any voice. Good luck.
It was a 10 hour print. Layer height was 0,194 mm and nozzle was 0,2 mm, post processes was failed but tool works well. Why failed acording to me ? Because I stick peaces together with an half milimeter error. But this did not made no working result.