Print as many of these as you can juggle! I designed them with a modified tennis ball/baseball pattern of two saddles that fit together, in order to print nicely on an FDM printer. They have a set of interlocking nubs that pop the halves together, and can be opened by prying and pulling one half out of the other when needed.

These are 68mm diameter balls -- you can scale them up or down to suit your juggling ball preference. 

Translucent PLA works very well, diffuses the light nicely, and is very strong when printed with solid walls as these are. You can also experiment with PETG for even more strength.

If you like, you can use two rubber bands or o-rings in the grooves for added security.

Settings for FDM PLA printer

• 0.2mm Strength
• 3mm brim for bed adhesion
• 6 wall loops (prints solid at these dimensions)
• Fuzzy skin applied selectively to outer panels only (for better grip)