When drawing a straight line, it turns into a curved line.

1.Parts of the machine are too loose.

A)Check whether the pulleys of X-axis and Y-axis are loose, and can be fine-tuned by the eccentric nut near the pulley. Not to be too tight between the pulley and the track.

B)Check the belt for looseness, tighten the belt.

C)Check if the laser head shakes, you need to tighten the screws to keep it vertical.