notice t0 for left extruder and t1 for the right one, sometimes the line comes writen in taht case change 0 or 1 as you like, if is not just write it your self, open the gcode archive with any txt archive manager even windows one, but if you said you have a sigma you just have to update the cura software theres one especific for the bcn3d sigma, from the cura you now have a case to chosse wich extruder you want…