Ruida offset with lower laser power

Have you measured the actual offsets at various speeds, then filled in the table? Remember to use half the measured distance.

Until you fix the offset problem, there’s no point in wondering what else is going wrong.

With that in mind, lower speeds may require much lower power than you can get from a 100 W tube, because it will have a high firing threshold.

Worse, those very low powers tend to produce erratic firing that burn random speckles across the material. This will be worse with a high power tube, because the pulses producing the speckles tend to run at the tube’s full power:

Basically, good engraving on a high power laser requires careful tuning with attention to fixing all the sources of error.

The Ruida controller computes the overscan distance from the Machine Settings speed & acceleration values, so there’s no external control… Those should be set to optimize the machine’s performance, but OEM values seem based on guesswork and cargo-culting, which leads me to think there’s some value in DIY tinkering.