@wilriker Thanks, last night I configure it that way, but i'm not so sure about this:
"If you have T0 also in your config.g this should then execute tpost0.g", as far as I understand it all the t macros are only executed if a different tool is selected, and since I only have one, T0 doesn't execute any macro.
I tried putting T0 in config and no, tpost0 is not executed.
Actually, I never bothered to check because my tpost0.g is more or less empty (I also have just this one tool)
It would be nice to execute it before each print because I usually tweak it between prints until I find the perfect settings.
In this case it would make most sense to have it in the start codes, I think. This does what you need plus it does not require any changes in the firmware. 😉