@Rom3oDelta7 I’m gonna just have to agree to disagree. An update, but my print looks fine till it reaches the complex Tree support part. The printing is fine as is as long as it isn’t in the super intricate stage. My MVS setting is set to 10 currently, and I only get crappy quality during the phase of intricate tree supports. Also, it isn’t wet filament, as it only occurs once it gets to the intricate part. It stopped immediately after the supports were done.
Please, feel free to disagree 
I never claim to have a definitive solution to problems presented in this forum because there is always incomplete information available. I do this only to share my 10 years of 3D printing experience in the hopes it will help people in their own journeys. If I get it right, terrific, and if not hopefully it helped you get closer to the goal.
IMHO, I still think you may be able to improve your results by printing more slowly. PETG does not print details as well as PLA due to the aforementioned phase transition energy issue. Therefore, you can get results that are OK when constantly extruding, but speed-related problems crop up when you start printing fine details and the extruder has to start and stop a lot more. Printing intricate tree supports could cause this to happen. You might try adding a height modifier for where the problem starts and then reducing the speeds for at least the perimeters. My eSun PETG settings set the outer wall to 80 and the inner wall to 90 (print temp of 253). eSun PETG seems to be prone to this problem so it should be better, but you might need to play with the settings some more to get rid of it.
Hope this helps!
Got my problems ironed out enough so they are sellable, thanks for the help. The reason I don’t think it is speed is because it’s not occurring during the intricate parts, its occurring in the middle of the easy part on the same layer. It just seems to mess up while in the middle of a line.
I also had a lot of problems with it - the solution for me was to deactivate Z-Hop. Of course the Z-Hop happens at the seam, but I also had a lot of these bubbles spread over the wall surface. I suspect that air is being drawn through the Z-Hop and this is what caused the bubbles in my case. After I deactivated Z-Hop, the bubbles also disappeared.
If I can now get the retraction adjusted properly, it will look perfect. I tested everything with Bambu Transparent natural PETG.
A1 Mini - deactivate timelaps and the blobbs are gone.
@Thenerdyone I have EXACTLY THE SAME problems - black esun petg with bubbles on walls. Tried to dry for 10h 70° С - didn’t help.
So, did you mange to fix this issue?
Upd. I’m printing 60 mm/s
I have found enabling “wipe on retract” in the filament settings to be helpful. At least when flow and pressure advance are calibrated after thorough drying.
For PETG Basic, I use similar speeds (<80 mm/s) but also reduce accelerations to 25% of defaults as speed limitations are not effective on the first 1-2mm otherwise.
Also, I usually get good preformance using a “full circumference” “scarf seam” combined with the “Arachne” wall generator.
And of course, all my infill and surfaces are non-crossing to lower the risk of nozzle pick-up while I usually also take over the cooling settings from Generic PETG.
I FOUND THE SOLUTION!!!
https_://forum.makergear.com/viewtopic.php?t=6749
It’s really work!!! (stupid bambulab forum doesn’t allow me to add picture, so link is here)
https_://imgur.com/a/WtdZWnW
Just decrees retract. It was even small - 0.8mm, but I tried to remove it at all (set 0), as described in the post. But it ruined my print. So I just set 0.3, and it works even with increasing the temperature.
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I am facing the same issue and went through all the suggestions without any success.
Setup:
P1S with SUNLU PETG black
Print temperature 245°c
Bed temperature 80°C
Print profile used: SUNLU PETG, Bambu Lab PETG HF
Preheated chamber to 30°C
Dry filament at 50°C for 8h and 70°C for 3h
tested switching off retraction (from 0.8mm to 0.3mm)
Still the same issue. Any ideas?
Regards
Michael
Calibrate pressure advance.
Did the calibration but did not solve the problem
