[solved]Path post-processor and GRBL

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The main Path wiki documentation page: Path Workbench links to: Project Commands - Creates a new CNC job., which leads to: Path Job - Output, which in turn leads to: Path Post

In bold at top of page:
Each CNC Controller speaks a specific G-Code dialect, requiring a Dialect-correct Postprocessor to translate the final output from the agnostic internal FreeCAD G-Code dialect.

The Options section has a large discussion on common options.

For specific options for your chosen Postprocessor, just hover mouse cursor over the "Arguments" input field.