I use the free version of Mach3. I generate my G code with Vcarve pro 6.5. I save my G codes as tap files. When I load them into Mach 3 and run them, they cut fine then they stop for no apparent reason. I have tried 3 different profiles in Mach 3 as I had one profile go bad and not work. But even with a new profile my G codes only go part way and then stop. I am at a loss as to why this happens. Even the road runner sample G code stops part way through. Could this be because I am using the free version? Any suggestions would be appreciated.