Bộ phóng tên lửa nước - O-ring in 3D (TPU)

I had hard time to find O-ring suitable for the design, therefore decided to print one and actually it works fine.

Printing setup can be found in the pictures.

Print with TPU, I used eSUN 95A, but softer will be better. Can hold the pressure inside the bottle up to the 5,5Bar.