I use my K40 with MKS SBase and Grbl 1.1f. I have a motorized bed and try to understand the working priciple for moving the bed between the steps in cutting.
If I activate the Z-Axis, everything is fine (excepts the fact I can’t home Z-Axis) and the bed is moving correct when I use the arrows in the Tab Laser Head movement.
But if I activate to move the Bed during cutting, it goes into the wrong direction - downwards instead upwards. I can move the bed upwards with a negative value in the Z Offset, but if I enter anything under Z step it allows only positive values which moves the bed down and not up.
Is that wanted? If so, is there any workaround (inverting Z Axis works, but than the arrows for normal movement are wrong) or setting in Lightburn? Or could you add possibility for negative Z step per pass?