I like how Mach3 deals with the M6 code. Not only does it pause the program, but it, at a minimum, allows you to jog to a new position. But, to me, the best part is that it will run a macro M06somethingsomething (I forget the name at the moment) that I will use to move the gantry to a convenient place to do a ‘tool’ (AKA nozzle) change and then run another macro when you press Cycle Start. I don’t have an immediate need for the second part, but maybe I’ll discover one once I implement the first.
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