Hej! If I generate gcode this will appear at the start: M140 S50 M190 S50 M104 S230 T1 M109 S230 T1 M104 S215 T0 M109 S215 T0 So this gcode will heat up one element after another. But it makes much more sense to just fire up each heating element and after that wait for each of them, like this: M140 ...