Ball

This ball prints in two halves and a center screw. When assembled, it forms a good sphere, and is able to stay together using only friction.

If needed, some glue could be added, but I haven't had any problems yet with any of them falling apart.

Update 2/1/2020: Added a shaky half which can have shaker pieces put in while printing to make the ball rattle.

Print instructions

Print out two halves and the center screw. Orient the screw so that a flat side is down (doesn't matter which side).

I recommend printing one at a time to reduce the amount of travels outside the piece to get the best quality.

Use the screw to connect the two halves and screw them together until they have a good firm fit.

If printing a shaky half, once the print gets high enough, put in a couple shaker pieces so they'll get sealed up inside when the print is finished.