Cura/resources/extruders/twotrees_bluer_extruder_1.def.json

{
    "version": 2,
    "name": "Extruder 2",
    "inherits": "fdmextruder",
    "metadata": {
        "machine": "twotrees_bluer",
        "position": "1"
    },

    "overrides": {
        "extruder_nr": {
            "default_value": 1,
            "maximum_value": "1"
        },
		"machine_nozzle_size": { "default_value": 0.4 },
        "material_diameter": { "default_value": 1.75 }
    }
}