frankforpresident

Hi Michael, I had the same issue as you and you made me understand what is wrong. The issue is located in the start g-code. It is actually missing the setup for the left extruder. I've managed to solve this by duplicating these lines and adding a start line for each extruder https://marlinfw.org/docs/gcode/T001-T002.html printer start g-code M107 ; start with the fan off G28 X0 Y0 ; home XY axes G28 Z0 ; home Z G92 X0 Y0 Z0 E0 ; reset software positions ;*** Start Dual Nozzle/Bed Preheating *** M140 S{material_bed_temperature_layer_0} ; start preheating the bed M104 S{material_print_temperature_layer_0} T0 ; start preheating hotend M104 S{material_print_temperature_layer_0} T1 ; start preheating hotend ;*** Wait until temperature reached *** M190 S{material_bed_temperature_layer_0} ; heat to Cura Bed setting M109 S{material_print_temperature_layer_0} T0 ; heat to Cura Hotend M109 S{material_print_temperature_layer_0} T1 ; heat to Cura Hotend ;*** End Preheating *** G1 Z15.0 F180 T0 G92 E0 ; zero the extruded length T1 G92 E0 ; zero the extruded length G1 E3 F200 T0 G92 E0 ; zero the extruded length T1 G92 E0 ; zero the extruded length G1 F225 Left extruder start g-code T1 ; Selecting tool Right extruder start g-code T0 ; Selecting tool fyi; left it T1 and right is T0. It is not a typo