Ball Cat Toy, hollow

This is a neat little cat toy I designed for our two new housemates. It's made up of two identical outer shells and one connector which all screw together. Did some tinkering because I couldn't get the fit right between the threads, so I ended up with quite some radial gap as well as a relief cut to be able to compress the connector and account for any accuracy issues. If it is still too tight for you, you might want to scale it in x and y direction while keeping z to conserve the correct pitch.

I've filled mine with standard 6mm plastic airsoft BBs, but I guess you can use anything larger than Ø 4 mm (diameter of the holes) to make some noise.

Our cats (predictably) love it, so there's that.