4 note whistle arrowhead
thingiverse
this is an arrowhead made for 9mm shafts, it whistles 4 separate notes and sounds pretty weird, some would say it sounds scary. pretty loud and durable if printed with pla+ feel free to change the chamber volumes to get different sounds and harmonies video below https://www.reddit.com/r/3Dprinting/comments/tkdt7m/4_note_whistles/
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