Levitate The Ball

Flow a polystyrene ball! Try to go as high as you can and then land it back safely. Apart from demonstrating interesting physics of the air stream, it also teaches you to control your breath. This helps for singing and playing musical instruments.

I used PETG with 0.3mm layer height for the original version. Can likely be printed with whatever material and settings you like but some PLAs might come out too brittle. Based on the feedback, I made a more sturdy variant for PLA and also made the exit hole smaller, these are the R2 files. (You can of course slice these for PETG as well.)

In R2 I also fixed a slight slicing problem - the round hole in a bridged layer is a notorious challenge, here I solved it by the hole being rectangular and gradually changing to round. (Another solution is a hexagonal progressive bridging as I did in the Collapsible Carrot).

Please publish your makes, it helps me to fine tune my models.