Puzzle Sphere Four

This is Sphere4.
The puzzle is easy to do, but difficult to undo. The trick is to let it fall (see https://youtu.be/a-_pex6gFh4).

This is the inner sphere of my other puzzle Cube Twelve (https://www.thingiverse.com/thing:3576321).

Remarks and pictures are welcomed.

_________________________________

**Print Details**: To have smooth spheres, it is better to print the pieces _on the side_.
My pieces do not fit very well at first, but after some use (and sand paper), they work fine. If you have ideas to improve this point, please contact me.