Pea whistle, small but strident

English: This whistle can be used as is, or with a small roll (the pea) inside to modulate the sound. The whistle body is small (3.5cm x 2cm x 2cm) but it produce 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 pause, and resume printing. You can also use a 6mm airsoft pellet in pl