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I did the same but never got to download the Emergency & Sports whistle. I fully agree with you and Love the Extremely Loud and Compact whistle and it is my go to due to it's ease of use and compactness combined with it's loudness. This was actually my Second loudest whistle though. that would be the STP_whistle but not the normal 3 chamber whistles as they aren't that loud. His Apito version which is included is the loudest whistle on thingiverse. It is however a little bigger and takes more air to get louder than the Extreme (my fav). Give it a try. The easiest way to get it to print properly is to let your slicer ignore the built in supports and add your own. I actually put it F360 and cut it out. https://www.thingiverse.com/thing:2225386/files

STP_Whistle