Igi82m

I replaced the original hotend set. This did not solve the problem. To get a good retraction test print without ozzing, I have to print, for example, PLA Silk filament much below the recommended temperature. This means that I have to print only with 190 C instead of the lowest recommended 210 C. Same with normal PLA filament, no more than 190 C. The retraction distance is 2.5mm, if I increase it, nozzle starts popping and leaving gaps in prints. Is this normal or something wrong with the printer?

I have an Anycubic Kobra. Yes, it should be 1-3mm. But with this retraction distance ozzing is worse. I tried again with the original fan, no luck. I will try to replace the hotend.

I replaced the original hot end fan with a Noctua 40x10mm. I'm not sure, but I think that after changing the fan, it started to ooze a lot more. If with retraction distance 8.0mm on direct drive and temperature 180C with PLA filament there is still a little ozzing, then I don't know what to do anymore.

Is it possible that if the Hotend fan cools poorly, ozzing can occur?

Does anybody have an idea what causes this outer wall skin lines?

I changed these settings and it is better. But it does result in a little rounder corners. (Picture). Retraction extra prime amount from 0.0 to 0.064mm Max Comb Distance with No Retract from All 0.0 to Within Infill 30.0mm Wall Thickness 1.6mm , if I change it to default, which is 1.2mm , under extrusion appears again.

I'm at work right now. I will try the settings you suggested and report back. And thank you very much for your help.

Coasting is off. Z-seam setup (picture). I have added two more pictures of the just finished printing. With the previous settings, not the new ones. You can see that the under extrusion is only on the left at the bottom, but the wall is good. On the back side, the bottom is good and the wall is under extrusion. Left side only. Thanks for the help. AK_Test file.3mf

I am noticing this weird under extrusion of the outline in one corner (always a left corner). What could be causing this? 3D Printer Anycubic Kobra. I use these settings. (on pictures)