cats love to play with their balls. Here's one in one.

Inspired by user Surveyor - Cat Toy :16402 on thingiverse

Was interesting to do in fusion 360. works well with pla, enjoy..i think humans will enjoy also with cats :)

to brim or not to brim...that's the question! works np on my elegoo neptune 3 no brim. but i would put 3mm brim just for kicks and be safe.

no support. i would go with a good quality basic .2 or better. the ball will roll better the higher resolution. obviously you will need to push the inner ball to break from its .8mm stem when printed.