Horizontal Line keep repeating (Voron Trident 250)

[Daehyoun]

Interesting symptom....
In my rectangular lithophane printing, my new Voron Trident 250 printer has some strange issue.

Certain layer was shifted and this symptom happens at every 3~3.5mm
Printer is Voron Trident 250 and just assembled and started to print and test it.
I thought CoreXY bed will not shifted horizontally, and there will not be this issue.
But, happened....

Any idea to try to improve this issue?

Thanks

Daehyoun