Cura/resources/extruders/voron2_extruder_0.def.json

{
    "id": "voron2_extruder_0",
    "version": 2,
    "name": "Toolhead",
    "inherits": "fdmextruder",
    "metadata":
    {
        "machine": "voron2_base",
        "position": "0"
    },

    "overrides":
    {
        "extruder_nr":              { "default_value": 0, "maximum_value": 1 },
        "material_diameter":        { "default_value": 1.75 }
    }
}