This is my Airless Tennis Ball design. Print it with 40% infill so you can have the real weight of a tennis ball. It prints approximately 16 hours at 50 mm/s on an ender V2 3D printer, so BabmbuLab will complete the task faster and more accurately. The ball has real dimensions. You can print with TPU, PETG, ABS or PLA material, the material depends on the use of the ball.