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Swell added to the bell to improve timbre of low B, C, and D. With the straight version of the extension these notes sound muffled.

Recommend printing with a raft, wall thickness of at least 1.2 mm, and infill at 0%.

I used PLA. Other filaments are likely fine as well.

Demo video:
https://youtu.be/8I5ej5xXZ_c

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