Hey Gaetano,
okay, recorded. I imagined that, but did not know it for sure, but now we all know: The hint with the invalid M0/M6 ; Txxx is for all who use just the Carbide Create Software (and own no Carbide machine), but those who own a Carbide machine and therefore have the Carbide Motion software installed get valid M6 code that runs as-is.
yes, since M0 means simply stop and the missing M6 will lead to no tool change being requested by the g-code program. This is how Carbide make its g-code invalid if you don’t own a Carbide machine and don’t have Carbide Motion installed (and for what my hint above is useful for). But you got to remove the semicolon (“;”) too! Otherwise the tool number is ignored. My ‘tool-change’ script honors the tool number.