box test 50mm

Please print with 0.2 mm stacking.

Please check all 4 sides.

If there is any misalignment as shown in the picture, it is evidence that the Z axis is not moving every 0.2 mm. 0.1 mm stacking would be impossible.

Most printers do not have a mechanism to adjust it. It doesn't matter how expensive the printer is either. The only way to improve it is to buy a new one.