Hi,

I have a Chinese laser co2 60w machine. Lihuiyu controller with CorelLaser
Everything was fine for a small period of time, and now I have a problem.

The engraving is uneven (you can best see it on white material) There are places where it burns more material and places where less material is burned. (engraved deeper)
I mainly engrave ABS dual layer material.
I did some research and my guess the laser tube or power supply for the laser tube or the material
I also checked so that the lens is not loose or moving inside the laser head.

I attached a picture.

Can someone tell me what is the problem. What should I replace?

Thank you!