PETG corners bulge out

[HerrB]

What has been done?

• All Screws and Belts have been checked at assembly. Some had to be tightened then. (not the root cause)
• Slowing down wall printing speeds (to 20mm/s) helped considerably.
• Jerk setting seemingly had no effect. (found suggestion online to increase jerk setting in order to have no slow down)

to Do:

• According to online recherche, this is a common issue of Bowden setups, as pressure builds up in the bowden tube, which cannot be relieved properly on corner slow-downs.
• Interesting to increase Print temps, I would have guessed it has the opposite effect.
• replace bowden tube vs a better option (or vs direct drive extruder) any suggestions for better bowden tube?
• replacing ender extruder versus a dual gear extruder (likely has little effekt but we'll see)
• Test if tightening the belt further has effect

Currenty in progress:
Replacing y axis vs linear rails and straight heated bed/build plate (likely has no effekt to this issue)