Ops. My mistake. I forgot to copy the licence file into mach3 folder when I changed computers. This is solved now and it finished all 800+ lines of code, but did not finish the job as it turned out to be only the roughing toolpath.

So I.m still interested in this: How do you approach this tool changing thing?
- One long g code which the cam software exported with the toolchange commands included?
- Or separate files for each toolpath? (like you manualy move the cnc, chnage the bit, rezero z axix, and click GOtoZ button on mach 3 which takes x and y to the start position of gcode)
- Or is there other way?