3D-Puzzle Ball

Can you solve this 3d puzzle? It consists of 18 parts, so seems to be pretty easy. In original size each cube has an edge length of 8 mm (little smaller because of some tolerance), so the whole ball has a diameter of 8 cm. The last two parts of the ball are clipped into place so you can throw and roll the ball without having to worry that it will fall apart.

Difficulty: Simple

Print instructions

It's an easy print. I made two stl files. One contains the four parts needing supports, the others can be printed very easy and without supports.