I will check my firmware and also try to tweak my retraction speed.
I really appreciate the tips! There are so many things that can happen.
Along those lines, does anyone know of a wiki site or something where we could post photos and slicer settings - and then have some sort of troubleshooting information on how to fix each type of printing problem that people are facing? That could be a very helpful thing!
This is odd... because the print part looks under extruded, but there's not just stringing but actual extensive in air extrusion it looks like. Is retraction happening when you are printing?
Do you see the extruder gear turn backwards, and then jump forwards again? There's a huge amount of stringing there... it's almost like the extruder isn't doing the backwards part of the retraction, just the forwards part.
Also, have you upgraded the firmware recently to a build-your-own version of Marlin? If so, you probably got the retraction speed fix, in which case a retraction speed of 40 is probably too much - try reducing it to about 25 or 30 instead.
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