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What happened?
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This is oozing. It's a subset of stringing. It's related but not exactly the wispy stuff you're gonna commonly see. This isn't plastic still connected to the part as the nozzle moves away. This is from plastic that continued to ooze out after the retraction and it builds up on the receiving part. They're angled like lightning bc the first blob is on the part, the second blob is on the first, etc, etc.
It's kind of solved similarly to stringing! In addition to what @tonyn@lemmy.ml linked, I've also used Coasting in Cura. Prusa Slicer doesn't have an exact analog to coasting. Coasting helps more when you have a bowden tube than a direct drive.