Did you print all the parts at once, or one at a time? Where there other parts printing when the bad part was printing?
In addition to George's comments, you might check your minimum layer time: make sure the plastic has time to cool properly before more is laid down on top.
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gr5 2,224
It looks like underextrusion but I don't know why it would get worse at the top. You had retraction everywhere so if it had anything to do with retraction (such as retraction speed so high it missed steps on the extruder) then it should appear everywhere. Did you lower the temp further up? Did you crank the fan higher further up? Maybe the PLA on the spool got slightly more tangled and you were on the verge the whole time?
Anyway to fix this kind of thing you can either extrude less PLA per second or you can raise the temp. Lower the speed will get you better quality overall so if you are patient then that is the better choice. If you are impatient like me then crank the temp to 240C and let the plastic flow! Of course you will get much worse stringing at 240C. Everything is a tradeoff.
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