Geeetech

Hello, I'm printing abs models with the A10 and I found good settings for the print quality, however, my prints are skewed in the Y axis.
I don't see how it is possible, if it was the motor that loose step it would be random but here it is very linear.
I leveled the corners the best I can and I think it can't be the plate that is not horizontal.
Finally as the printer uses geers, it can't be the belt that would slide.

So what is it ?
Can it be corrected programaticaly when generating the gcode or even in the printer settings ?

Thanks in advance

Hm... Try to mirror the model in slicer and try to print that.
And what about calibration cubes? Have you printed them?