This is a solid, two-part pingpong ball (standard size- 40mm diameter).
It's printed in two parts with a connecting pin for ease of printing, and to give the option of printing the pieces in multiple colours for a split- colour ball (without AMS). Simply print one pin and two halves, then glue them all together.

It's pretty solid and rolls well on ball tracks (which is what I needed it for when I designed it).

Link to the straight track component shown in the pictures:

https://makerworld.com/en/models/372642

Link to the ‘catch-cup’ component shown in the pictures:

https://makerworld.com/en/models/372706