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Sorry for the potentially silly question, but what's the purpose of the top ~20 layers (at 0.2mm later height) of this model? Does the resulting chamber serve some purpose as resonance, or is it just so the outer of the design has a nice curve instead of a flat part?

It's pretty fascinating to look at this as it gets built, you should write a blog post or make a YouTube video about your design process and the other 28 iterations :)