I am pleased to announce the release of v1.0.36 Get it here Releases · OpenBuilds/OpenBuilds-Fusion360-Postprocessor This one, I believe, finally provides a fix for arc error 33 and prevents them occurring in all orientations. Do note that while the post works perfectly for arcs in all planes, in this release only XY arcs are enabled as this state will suite most users most of the time. Uncomment line 80 if you need YZ and ZX arcs.