Quick tips for successful print: 

• Use 3Dlac, glue stick, or Magigoo for better adhesion.

..or simply clean the bed with isopropyl 

•  Reduce flow rate to .95

• If you are experiencing difficulty with bearing rotation, don't worry it should loosen up and become much smoother over time, or add some lube.

• For best results, ensure the bed is not too close to the nozzle!

These dimensions:

8 x 22 x 7 mm - 608 

9 x 24 x 7 mm - 609

15 x 28 x 7 mm - 6902

10 x 26 x 8 mm - 6000

12 x 28 x 8 mm - 6001

15 x 32 x 9 mm- 6002

On the other hand, it is a good toy for a cat, what do you think?