Cura/resources/extruders/elegoo_neptune2_extruder_0.def.json

{
    "version": 2,
    "name": "Extruder 1",
    "inherits": "fdmextruder",
    "metadata": {
        "machine": "elegoo_neptune_2",
        "position": "0"
    },

    "overrides": {
        "extruder_nr": { "default_value": 0 },
        "machine_nozzle_size": { "default_value": 0.4 },
        "material_diameter": { "default_value": 1.75 },
        "machine_extruder_start_code": {"default_value": ""},
        "machine_extruder_end_code": {"default_value": ""}
    }
}