This is a whistle of death of the Atstecs. Type whole dw1.stl or type two halves of dw01.stl and dw02.stl and glue together. Blow into the upper hole. A frightening sound should come out like this: https://www.youtube.com/watch?v=zXIo0EbniZo&t=35s
I did not try it myself. Made according to the drawing.
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