VEVOR E490T Manual Del Usuario página 151

Check the stepper motor, remove the front cover, synchronize the pulley
and whether the synchronization is fixed properly; adjust the limit plate on
the nut, which can be adjusted back and forth until the display size
matches the ruler, and then lock the fixing screw.
 Cutter adjustment
First adjust the cutter depth fine-tuning device (adjust the depth range
5mm or so) or change the cutting surface of the blade; deepen clockwise
and counterclockwise.