Quote Originally Posted by richardphat View Post
The slicer just had failed on your cylinder.
This happens often with thin wall extrusion, fast print and on top of that if you ever print with high Z layer .

One solution to check, print one, but slowly with .1 or .2mm height AND try to increase thickness of the object itself.
I'm noticing that even with slow extrusion of the outlines that the retraction is always at the same point on the cylinder. Is there anyway to change the same retraction point on the Z axis?