Thanks for your response.
The strange thing is that with my previous nozzle and the same filament (Ultimaker filament) I never had this problems, the retraction was working perfectly at 4.5mm and 50mm/s and the extruded material was smooth at 210ºC and 40mm/s. I don't want to remove all the stringing every time I print something. The software is the same, the version is the same, the firmware is the same... the nozzle is the only thing I changed. Could it be that there is something wrong with this nozzle?
You are right with the bed leveling, when I printed that objects it was a bit offset, but in the pyramid example there is underextrusion if I go lower than 230ºC, do you need that temps to extrude correctly at 30-40mm/s?
Anyway, I'll try with more retraction distance and post the results.
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gr5 2,257
Wow! Nice video. Lots of information packed into 3 minutes 46 seconds.
For the most part you have things working pretty well. And you are trying the correct things (slower speeds, lower temps) to reduce stringing. And your stringing is everywhere but the strings are quite thin - I've seen worse but I've also been able to get it to zero if I try hard enough. I suspect the strings you *do* have will come off very easily and cleanly. I think you are close enough that if you just try a different manufacturer's filament you might be able to get it to zero stringing.
Also fan is important for that pyramid. Each post doesn't have much time to cool with almost constant contact to a hot nozzle so it's extra hard to stop stringing. Was your fan on during the pyramid support printing?
When retraction occurs, look at the top of the arc of the bowden tube. Make sure the filament goes from touching the top of the tube, to the bottom of the tube at full retraction. If not increase your retraction by .5mm. My retraction is at 4.5mm and that is about perfect. If you retract too much you get air in the print head which alternately causes first over and then under-extrusion.
One thing that I definitely saw was a problem was your first layer. You have a shot where you printed only the first layer of several complicated shapes and in the video there are some holes which you might think is "under-extrusion" but in fact is just bad leveling. You need to press the first layer down into the tape a little better. So raise your bed by about .1mm and try that first layer again (.1mm is about the thickness of a piece of paper).
Here is a photo of how the first layer should look (look at the skirts):
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