Double sphere tower

I made it to learn how to print sphere-like object and test the layer fan.

Without layer fan even 3 mm/s printing speed might produce sag at the lower bottom of sphere. The printing speed was 60 mm/s during the session.

Pronterface log

The print goes:
- from -18.21 mm to 17.80 mm in X and is 36.01 mm wide
- from -17.76 mm to 17.76 mm in Y and is 35.52 mm deep
- from 0.00 mm to 48.41 mm in Z and is 48.41 mm high
Estimated duration: 194 layers, 0:36:09

Setting print speed fact