Thanks for comment @all.
It works fine for me, not out of the box, but do its output (*.nc) very easy.
After this, i edit the *.nc by my self to add M03 and M05.
And yes, i also remove some commands in the *.nc file.
Then, using gcodesender with seperate nano + firmware grbl1.1e.
For cutting it works.
@ Ralph: "Elstlcam" works stright and with focus.
The developer must it be also too (i think so, never known) , as his program is.
@ Zak: His mind, who knows.
Estlcam is also usefull for another job.
My machine has webcam mounted.
Together with "Estlcam" ,its display and the camera function, i use it for measure.
Webcam is used too for other things, set zeropoint, checking backslash and play and last, but not least, see how the laser is working.