I see the Y Axis do a rapid studder or jitter when cutting. I am using arcs and first seen it when cutting soft material like foam and it does appear in the cut material. I verified the issue also happens when running without any stock under it.
This may only happen when turning a longer corner but I can’t be positive.
I have checked belts and bearings as well as free movement of the core. I am using the SKR 1.4 and 2209 V1.2 Drivers. Please let me know if there is additional info I can provide to help diagnose this problem.