Pea whistle, small but strident

thingiverse

This whistle can be used as is, or with a small roll inside to modulate the sound. The whistle body is relatively small but it produces a loud and strident sound. If you want to add the small roll in the whistle body to modulate the sound, print the roll before the whistle body. In your slicer, insert a pause at 16mm of the whistle body print. During the print, insert the roll when the printer pauses, and resume printing. You can also use a 6mm airsoft pellet in place of the small roll.