Jogging Y Axis not straight

So there I was trying to calibrate the steppers… and I noticed that when jogging around 700mm the Y axis shifts or should I say it seems to shift 1.86mm to the right…I put a ruler down taped to a piece of mdf up against a fence and sure enough it isn’t a straight line… I’m wondering is my Y rails not parallel or something?

Take a tape measure and measure across opposite corners. Square means those diagonal measurements should be the same. There’s enough play in the holes and fasteners to adjust it.

How to Square the XCarve Easy (No Math and No Complicated Tools) (

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