Mosquito and blobs at the end of perimeter
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Okay, that is even more curious - I decided to experiment with the retraction speed, and lowering speed actually fixed the problem, no idea how is that even possible.
On this photo, I change the retraction speed from 100 to 25 each 5mm, so speeds from 25 to 75 provide best results.
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@skayred said in Mosquito and blobs at the end of perimeter:
I change the retraction speed from 100 to 25
Purely speculation, but perhaps such fast retraction was breaking the filament inside the nozzle and introducing some air? Then when unretracting it was causing the bubble to pop?
Either way, once you have PA tuned, you should retune retraction since the amount required will likely go down a bit.
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@skayred said in Mosquito and blobs at the end of perimeter:
I change the retraction speed from 100 to 25
Is it PETG? Then you can find that dependency on the web.
I had similar issues.
The biggest I have noticed was: I had extreme under extrusion after retraction. Witch leads to gaps printing a single perimeter cube.
After changing extruder, nozzle, hotend.....without success, I noticed that a much lower temperature was reducing the gaps.
That set me on the path looking for the right filament settings.
In the end decreasing the retraction speed to around 30mm/s did the trick…
“The faster, the better” isn’t valid for PETG. -
@DIY-O-Sphere yep, exactly PETG, and I have no idea why 100mm/s retraction for the same spool was fine for E3D V6 with PTFE but not so fine with all metal Mosqito
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@Phaedrux well, it could be but impossible to analyze
All the prints with 100mm/s had two common issues - overextrusion right after retraction, and some kind of 'extra extruded filament' on the other side, so what you said seems to be the most logical idea. I cannot blame Mosquito, it could happen because of various reasons - from spiral-like bowden tube to strange pneumatic clamp I use (accidentally bought small clamp for aluminium and then had to press the brass part inside)
