I have not used artcam but in my experience with similar programs Masso can read most Mach3 posts. Based on the available post processors on the AutoDesk web site you should be able to use the Mach3_4-MM-Arcs.com post processor in ArtCam to output a standard text file with the necessary G-Code that Masso should be able to read. However, you may need to rename the file using one of the recognized file extensions if they don't offer an option to set it properly in ArtCam. The recognized extensions are found on this page MASSO SUPPORTED FILE EXTENSIONS. I would try it with a simple part to test if it works to your satisfaction before committing to a large program. Hope this helps!