README

Postprocessors for grblHAL and Grbl

This repository contains post processors or link to post processors for Grbl or grblHAL that supports additional features in grblHAL, and other useful information as well.

Further links to post processors and useful information will be appreciated.

Autodesk/Fusion 360

Grbl/grblHAL post processor.

Experimental grblHAL post processor by @raenji-sk. A fork with new updates grblhal pp by @Dietz0r

Disabling G2/G3 arcs. G2/G3 arcs in ZX and YZ planes cannot be rotated.

Autodesk PowerMill

grblHAL post processor for Autodesk PowerMill 2026 by @coolboysalam. Supports 3-axis metric milling, G0/G1, G2/G3 with IJK arc centers, helical interpolation, spindle control and manual tool changes.

FreeCAD

Some info about the Grbl postprocessor can be found in this thread. grblHAL supports many canned cycles so can be used with the --no-translate_drill option.

Vectric

Select File > Open Application Data Folder and then open the PostP folder to find the available post processors. Grbl_mm.pp or Grbl_inch.pp are for Grbl/grblHAL.

NEW: experimental postprocessors for use with the grblHAL plasma plugin.

Solidworks

Grbl postprocessor. Mentioned in issue #5.

Useful information

A lengthy discussion in an issue related to probing and gcode rotation - including post processor issues.

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2026-11-01