Cura/resources/definitions/ultimaker.def.json

{
    "id": "ultimaker_base",
    "version": 2,
    "name": "Ultimaker",
    "inherits": "fdmprinter",
    "metadata": {
        "author": "Ultimaker",
        "manufacturer": "Ultimaker",
        "visible": false
    },
    "overrides": {
        "material_print_temperature": {
            "minimum_value": "0"
        },
        "material_bed_temperature": {
            "minimum_value": "0"
        },
        "material_standby_temperature": {
            "minimum_value": "0"
        }
    }
}