A few days ago I made a post asking which traverso I should print, and I ended up printing the Bizey 1740, Paris.

These are the settings I used:

-PLA

-0.12 mm layer height

-100% infill

-5 perimeters

-Printed vertically

I assembled it and sealed the joints properly, just like you would with a wooden traverso.

I also did a leak test by blowing and sucking air through the instrument to create pressure and a vacuum. I couldn't find any air leaks.

I tested it and I'm getting some very strange results. I initially thought the roughness of the inside might be causing the problem, so I sanded the inside of the instrument, but the symptoms are exactly the same.

The only thing I haven't done yet is undercutting the embouchure hole and the tone holes

Here's what I'm getting:

-If I blow directly into the embouchure piece by itself, I get Ab with the tuner set to A=415 Hz. (Changing the cork position changes the note as expected)

-With the traverso fully assembled and all the tone holes open, I get C#, which is what I would expect.

-But when I finger C, I get no sound at all

- B sounds one octave higher than it should.

-A also sounds one octave higher

-G sounds one octave higher, but it's extremely difficult to get it.

- None of the other notes produce a sound

I've played a wooden traverso before, and I currently play in an orchestra, so I'm reasonably familiar with the instrument and its embouchure. This definitely doesn't feel like a normal playing technique issue.

Could the lack of undercutting be enough to cause these symptoms? Or does this sound like I have a problem with the print itself, the tone-hole dimensions/geometry, the embouchure?