Making my Whistle Hollow

This part of the 3D printing design I wasn't looking forward to because I wasn't quite sure how to hollow out my whistle. I decided to talk with someone in the 3D printing lab and ask before I attempted. They quickly and efficiently showed me and I was off to finish it! I was able to hollow out the inside, but made sure to keep a ball inside, so my whistle would make noise. I am now ready to print and we will see how my whistle has turned out!