Transparent whistle from PET with ball and hole

Transparent whistle with ball and hole The whistle contains a hole for passing the cord, a groove for attachment in the mouth and is complemented by a ball that causes a change in frequency. 📷 Image redacted — claim this model to add your own media Whistle made of transparent material. We can observe the movement of the ball inside due to the airflow. Classic whistles have a hanging ring, but that can be broken. This whistle has a hole built directly into the body. 📷 Image redacted — claim this model to add your own media It would be difficult to make a ball using FMD technology and it would not achieve a smooth surface. A better way is to insert an airsoft ball with a diameter 6 mm during printing. 📷 Image redacted — claim this model to add your own media Whistle made from transparent material. You can use filament from recycled PET bottles, or recycled PET-G. The ball moves due to the rotation of the air from the spray. When blowing through the human lungs, the sound is clearer and louder. Also, the ball moves much faster. Included ball causes a change sound frequency.