I have had this on hollow parts too. I don't have a solution. For some reason the slicer decides to make travel moves across the opening. I can't see any reasoning for this since its a single island model. What settings would cause the slicer to cut across the center?
Is combing turned on for the LH print and not for the RH?
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gr5 2,224
Shell thickness of 1.0mm is bad - this can result in horrible prints because it is trying to squirt out 1mm of filament with a .4mm nozzle in 2 passes (.5mm each pass) which can give you bad underextrusion. That's probably not the problem I see in your print but still - FIX THAT RIGHT AWAY. You want shell thickness to ALWAYS be an integral multiple of nozzle size.
I would go into the tune menu while it is printing and just slow it down and cool it down. Try printing at 50% feedrate and lower by 10C and see if that helps the quality. This stuff inside your cylinder however should remove very easily.
I'm not certain what is causing that - probably bad retraction - but I can't imagine why it would happen on one print and not the other.
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