This is a star gyro. Stars are rolling on one axis.
Before this, I made the star gyro that axes are intersected.
But did not turn becouse one star hits another star.
So axes are same position.

There is a small hole on top corner of outmost star.

I got a inspiration from Customizable Easy Gyro by atartanian. Thanks!

RepRap

Prusa Mendel i2

Doesn't Matter

No

0.15mm

40%