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I printed it and it worked perfectly - your idea of getting rid of the internal features to save material worked great, this only uses half as much plastic as the v29. However, it got me thinking - could it be shrunk and still retain the original functionality?

Well, I gave it a go and made a working, compact version that's 1/3rd the size and uses 40% less material. I've posted my remix here - https://www.thingiverse.com/thing:3431758 . Hope you like it!

P.S. Many thanks for posting your source files. I initially tried editing the v29 directly, but Fusion 360 chokes when you attempt direct mesh editing. Your .step file was a lifesaver.

v30 (v29) Whistle - Compact Edition
by LMF5000