Yeah, in fdmextruder.def.json there are variables that We can use in other files to access, I use it, but unfortunately does not has variables to get the second one, maybe should I create my own variables? idk yet, thank you to tell me what you know, appreciate it. I figure out that ultimaker get the second extruder seeing their gcode, I'm reading their files to understand, if you wanna see, this is a piece of gcode generated by an ultimaker S3
;EXTRUDER_TRAIN.0.INITIAL_TEMPERATURE:200
;EXTRUDER_TRAIN.0.MATERIAL.VOLUME_USED:2127
;EXTRUDER_TRAIN.0.MATERIAL.GUID:44a029e6-e31b-4c9e-a12f-9282e29a92ff
;EXTRUDER_TRAIN.0.NOZZLE.DIAMETER:0.8
;EXTRUDER_TRAIN.0.NOZZLE.NAME:BB 0.8
I think they get the informations of the second extruder calling EXTRUDER_TRAIN_0/1 and the variable, but I still did not find how to do it and I added the second extruder in files but I cannot access like that