{
  "version": "0.1",
  "nodes": {
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      "name": "Plate",
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        "size": {
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          "y": 60,
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        }
      }
    },
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    },
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    },
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    },
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    },
    "6": {
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    },
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    },
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    },
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      "id": 9,
      "name": "Holes",
      "op": {
        "type": "Difference",
        "left": 1,
        "right": 2
      }
    }
  },
  "materials": {},
  "part_materials": {},
  "roots": [
    {
      "root": 9,
      "material": "default"
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  ]
}