Fig. 4.

Model sketches and 3D-printed rendering of the cup and ball with different dimensions (radius of curvature and rim height); θ indicates the angle of the rim height. A. Model of the Deep Cup No Ball. B. Model of the Deep Cup With Ball. C. Model of the Shallow Cup With Ball. D. Real 3D-printed Deep Cup No Ball. E. Real 3D-printed Deep Cup With Ball. F. Real 3D-printed Shallow Cup With Ball.