Cura/resources/definitions/uni_300.def.json

{
    "name":      "Uni 300",
    "version":   2,
    "inherits":  "uni_base",
    "metadata":  {
                  "author": "Nail` Gimadeev (C)",
                  "visible": true,
                  "quality_definition": "uni_base",
                  "platform": "uni_300_platform.stl",
                  "platform_texture": "uni.png"
                 },
    "overrides": {
                  "machine_name":   {"default_value": "uni_300"},
                  "machine_width":  {"default_value": 320},
				  "machine_depth":  {"default_value": 220},
                  "machine_height": {"default_value": 250}
                 }
}