this is a fully functioning myan death whistle that I made in tinkercad and it took ages to get to work but it works now
I based the inside of the myan death whistle by tony
Mayan Death Whistle by Tony | Download free STL model | Printables.com
but it is not a copy I had to edit it quite a bit to fit the sphere and still work
The author marked this model as their own original creation.