@nicolab28 said in First T0 in gcode, does not work:
The problem with the T-1 is that if there is a filament loaded at the beginning of the print, it will unload it.
You can use T-1 P0 to deselect the tool without running the tool change files, if you don't need any part of the free file run.
There is a method / trick for heating the hotend without selecting a tool?
Use T0 P0 to select tool 0 without running any tool change files, then you can heat it.