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Temp gcode not in start gcode of Cura?

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Hoping someone can help me figure this out. I'm trying to set up RGB lighting for my printer, I've got it mostly figured out, however, I'm trying to get a red light to come on when the printer starts heating up. As it is, I can only add that code in Octoprint, since Cura doesn't seem to show the bed and tool heating code in the start gcode section. I can see this code when I look at it in OctoPrint, but how do I access it in my slicer program? I don't want to have to modify each individual gcode before I print every time in OctoPrint. Is there a way to put custom temp code in the start gcode of Cura and not have it auto-generated? Basically, why is the boxed g code (M190, M104, M109) not by default in the start g-code of Cura? and is there a way I can put it in there? I'd like to add a M150 command at the very start, but I can't because it will put the bed and tool heating code before that.


I've tried adding the below code at the start g-code section:


M150 R255; turn on red LEDs


M190 S{first_layer_bed_temperature} ; set bed temp

M104 S{first_layer_temperature} ; set extruder temp

M109 S{first_layer_temperature} ; wait for extruder temp
M82 ; absolute extrusion mode


however, it still adds additional M190, M104, M109 before it when I look at the gcode in OctoPrint.






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Hello @ahoeben, while you're here did you see the request the other day from a user to be able to have multiple extruders with a single heater? I think quite a lot of people would probably like that. I suggested that I would do the engine stuff if some heroic person worked on the front end. It probably doesn't need much, maybe just a checkbox to say that all the extruders share a heater. Are you up for it?

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thanks smartavionics, using the material command was the thing to do!


from an earlier reddit post I made, someone else suggested which worked: 


M140 S{material_bed_temperature} ; heat bed, nonblocking

M104 S{material_print_temperature} ; heat hotend in parallel ;


M190 S{material_bed_temperature} ; heat bed, blocking

M109 S{material_print_temperature} ; heat hot end, blocking

Edited by Tetra84

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