Cura/resources/extruders/hctech_hc300-m3_extruder_0.def.json

{
    "version": 2,
    "name": "Extruder 1",
    "inherits": "fdmextruder",
    "metadata": {
        "machine": "hctech_hc300-m3",
        "position": "0"
    },

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