Cura/resources/extruders/bfb_extruder_0.def.json

{
    "id": "bfb_extruder_0",
    "version": 2,
    "name": "Extruder 1",
    "inherits": "fdmextruder",
    "metadata": {
        "machine": "bfb",
        "position": "0"
    },

    "overrides": {
        "extruder_nr": { "default_value": 0 },
        "machine_nozzle_size": { "default_value": 0.5 },
        "material_diameter": { "default_value": 1.7 }
    }
}