I am a complete novice when it comes to laser engraving. However, I have a bit of experience with 3D printers and also own some. The technology is relatively similar with a diode laser?
I have already successfully engraved larger, coarse items. However, I have now noticed during my material test with LightBurn that I have waves on one axis. I don’t really have any idea what the reason for this could be at the moment. I have already tightened the belts, but maybe too much? The material is flat and lies flat. I’m also happy with one axle, it only seems to occur on the other axle.
A developer will be able to clarify it properly. However, while 3D printers works with 3 axes, the laser machine only works with two (2D)
The part of the codes relating to the axes will be somehow identical. Then there is the laser control part which will be the most technical and developed part compared to the 3D printer.
Regarding the wave issue, I would say that there is some mechanical problem, could be tightness in the guides, damaged bearings or even dirt on the rollers.
Soon you will have other opinions that you can check too.
The problem you are having is moving the machine too fast
I would verify a couple things in order
a) X axis, make sure the eccentrics on the rollers/wheels of x axis are correct and the axis is snug to the frame without slack
b) on the text layer - slow it down a LOT. vector work has much heavier effects of accelerating and decelerating the mass of the laser
c) try engraving 2 small cubes, rotate engrave angle by 90º on one of the cubes layer settings
Then you can compare the effect of the Y and X acceleration/Decelerations
