Does positional accuracy prioritized the z-axis?

I feel like the z-axis position is more accurate than x and y on the uArm Swift Pro. Is this just my imagination or is the kinematics prioritized this? I figure this might make some sense because in 3D printing (which is an app of the arm), this would be most important axis to get right.

Hello,
In fact, the settings of our x, y, and z axes are all the same, but the actual coordinates of the x, y, and z axes will have deviations, and the gearbox will have a gap, causing the end to shake.
thanks.