This model is a Poke Ball tsurikawa!

This tsurikawa has a diameter of 10cm and is 1cm thick.

Tsurikawas are designed to work with a 1 inch (25mm) nylon strap, 2x M4x10 screws and nuts, and a 3D printed strap lock (the models for the strap locks are available free - check out my other designs!)

The images show the final product - an assembled tsurikawa!

To print the back of the two sided version perfectly, colour it in your slicer and set the height on the bed 0.2mm lower than default.