{
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    },
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      "op": {
        "type": "Translate",
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        "offset": {
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          "y": 0,
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    },
    "4": {
      "id": 4,
      "name": "Hollow Cap",
      "op": {
        "type": "Difference",
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        "right": 3
      }
    }
  },
  "materials": {},
  "part_materials": {},
  "roots": [
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}