1.
The error "Grbl error 20" is reported by Grbl when an unknown command is received (e.g. m6).
GrblGru then interrupts the running program and displays a corresponding error message.
The user can then decide whether he wants to continue or quit the program.
The command that triggered the error is displayed in the left controller window.
If you are sure that the unknown commands are not important for your program,
you can suppress the error message 20 in the settings. No more error messages will be displayed.
2.
Unfortunately, the "stock" panel is currently only intended for you to use GrblGru as your CAM program.
For example, if you load a DXF or SVG file, the required dimensions of the stock will be calculated automatically.
You can only add an offset. But I will change this in the next versions so that you can enter the dimensions as well.
Then you can use this if you have the GCode calculated by another program.
Your machine model looks great. Have you ever thought about making it available to other users?
I would like to include it in the GrblGru machine park.

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