Rough area on PLA printed round surface

[broutilde]

Hello everyone, so I’ve been printing for a while on other printers and got a XC1 a year ago. I’m always printing the same files (designed by myself) that I sell. I’ve been having this issue with my XC1 where I can see those rough lines on the print (see pictures). It’s like a ring of roughness all around it.
It doesn’t do it on my other printers. It’s always the same files, printed in PLA. I already tried a few things :

*adaptive layers was the first thing I did. Lowered the layer height to 0.8 in that area, smoothed it out and it didn’t work.
*changing filament brand. -slowing down outer walls speed
*turning off auxiliary fan

I was wondering what else I could try to to make it look smoother. Sanding down is not an option especially on the black color, it makes it look worse.

Thank you for your help

[user_3026326371]

Assuming it is not an extrusion or calibration related issue…

It is a quite shallow angle…
Do a small test print of a slope with a similar angle and check the nozzle during the print.
Quite often it is residue build up that ends on the print during these unfavourable angles in round objects.
If that is the cases than take the sock off, clean it and use silicone oil on the outside where the nozzle is.
Use a cotton bud or lint free cloth to also wipe some silicone oil over the nozzle - wipe off with a dry paper towel then do some thin prints so the top layers can remove all leftover silicone.
After that not much of residue should accumulate during printing.

[broutilde]

I’ll try the silicon clean up and will update! Thank you.