Help !

[Gaitss]

Hello,
I have a Rostock V1 with E3DV2.
I started last year with Repetier then from the beginning of the year with Mattercontrol.
I made nice impressions unraveling me.
But I have a big problem since one month.
I have some edges of areas and I fail to understand why. See the pictures.
I recalibrate everything, then uninstall mattercontrol. I went from Cura to Matter unchanged. I can not use slic3r since the head out of bed and I have not found how to solve this problem with my rostock.
Who can help me ?
Gains

[mhackney]

Those square parts look "unsquare". I'd check that the pulley grub screws are tight and that the pulleys are not slipping a little. Also make sure the steppers are secure and the belts are not loose.

[Gaitss]

Hello,
I've seen everything but I still have the same problem ...
I will try to take back point by point the advice read these links "A Strategy for Successful (and Great) Prints" and "Strategies for Resolving Print Artifacts"
Gaitss