Lightball

This is a lightweight sphere constructed out of ten rings. The outer diameter of the sphere in the STL file is 120mm, the rings have a width of 4mm and a thickness of 6mm (into the direction of the centre of the sphere). The model comes together with the corresponding SCAD file so you can adjust all parameters on your needs. Or you can just open it in the Thingiverse Customizer and specify the dimensions there. I have not tried printing the model yet.