I printed my in HTPLA but didn't bake it. Took a couple of hours with no supports but I used a skirt, which had to be cut away. Absolutely zero issues with no supports. Used vinyl glue to join the halves and then sanded it and did a little smoothing. Airtight. Probably won't make it too pretty. High resolution with very thin layers, as suggested. I'd be interested to see what different infills would do to the tone but 25% works out fine.
Notes are distinct and fairly easy to obtain right from the get go. The quality of the sound is somewhere between a pan flute and a recorder. Not unpleasant. Fingering uses a few neat combinations and it's definitely a treble instrument. Capable of more notes than I thought,I think it can play a full D-G scale.
Haven't held it up to a tuner but, again, each tone is distinct and I think it would do fine for a performance. I've got a songbook and I'm planning on it using it like a harmonica; something simple you can pull out and whittle away a few minutes in the evening.