New setup on Elite forman. I noticed during assembly that when I move the gantry by hand (unplugged) that the left side was catchy and grabby along most of the travel. When moving under power it has a kind of pulsing movement on the left side up can feel in the overall machine. Also looks like the ball screw is slightly wobbly. Right side is smooth as silk.
Most noticeable in continuous mode at or above 50% speed.
Both motors working no error lights
The QCW frame is square to less than 1/16" variance.
Besides a ball screw that is simply bent a little too much (should be replaced if it makes such errors, write to email@example.com if you cannot find another cause), I could think of point 7) (ball end nut too tight) in this document