I was printing PLA, it looks ok up to a certain height (although it was warping slightly), but then it becomes ugly. I will do a test print of the same height, butaybe you already have an idea.
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Maybe it was just tangled filament?🤔
White my test print from afterwards (after unspooling the last two meters from my first self rolled spool 😅), grey a print from a few days ago.
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Depending on your printer the z axis lead screw might need cleaning and lubrication. I would get this on my ender 5 plus occasionally at a given height if the lead screw needed cleaned.
Looks like a clog, could be caused by too much retraction, too high temp combined with too low print speeds resulting with the filament being cooked inside the nozzle.