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Thanks for the wiki link! :)

After previous jams I came to the conlusion myself that retraction had to play a part in it... So I´ve reduced retraction to 0.7mm for PLA, 1mm and up caused problems as you describe. I couldn´t see any adverse effects of the reduced retraction distance either... Retraction plays a big part in it, but not in this particular case since my print was a spiralized vase (with no retraction)