{
  "version": "0.1",
  "nodes": {
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    "2": { "id": 2, "name": "bore", "op": {"type":"Cylinder", "radius":10.0, "height":42.0, "segments":64} },
    "3": { "id": 3, "name": "bore_positioned", "op": {"type":"Translate", "child":2, "offset":{"x":0.0,"y":0.0,"z":-1.0}} },
    "4": { "id": 4, "name": "pipe", "op": {"type":"Difference", "left":1, "right":3} }
  },
  "materials": {},
  "part_materials": {},
  "roots": [{ "root": 4, "material": "default" }]
}