Cat Ball

I saw this cool trapped ball toy, but there were no SCAD files so I made my own.
STLs are ok, but I really like the source to allow customization.
So you can play with the SCAD file and make any changes you like, including the number of columns, and the STLs provided are set with a radius of 50mm.

In the photo, the smaller one at 25% size printed fine even without any supports.
I think this was a miracle, as even the small sphere printed with barely any contact to the print bed!
When I upped it to 50% size, it failed twice, so I added a brim and it was fine.