This is one of my oiginal creations. Is a Variation of the Brain Gear. It transforms from a Sphere into a Rhombic Dodecahedron.

You need

12 Pieces
24 Pins
6 Connectors

You can also just print the "All" File, it has everything you need

Print Settings

The Pieces/Gears could need a brim. No supports.

Assembly

I made a Video about that. Watch the video
There is also a Assembly PDF included in the download.

Troubleshooting

To tight.
If the standard Connector is too tight, print one of the other connectors provided. The higher you go, the more loose everything should become. But there is also too loose when the gears stop engaging properly.