{
  "version": "0.1",
  "nodes": {
    "1": { "id": 1, "name": "Base Cube", "op": { "type": "Cube", "size": { "x": 100, "y": 20, "z": 8 } } },
    "2": { "id": 2, "name": "Base Translate", "op": { "type": "Translate", "child": 1, "offset": { "x": -50, "y": -10, "z": 0 } } },
    "3": { "id": 3, "name": "Hole Cylinder Center", "op": { "type": "Cylinder", "radius": 3, "height": 8, "segments": 32 } },
    "4": { "id": 4, "name": "Hole Translate x=-40", "op": { "type": "Translate", "child": 3, "offset": { "x": -40, "y": 0, "z": 0 } } },
    "5": { "id": 5, "name": "Hole Translate x=40", "op": { "type": "Translate", "child": 3, "offset": { "x": 40, "y": 0, "z": 0 } } },
    "6": { "id": 6, "name": "Holes Union 1", "op": { "type": "Union", "left": 4, "right": 3 } },
    "7": { "id": 7, "name": "Holes Union 2", "op": { "type": "Union", "left": 6, "right": 5 } },
    "8": { "id": 8, "name": "Rail With Holes", "op": { "type": "Difference", "left": 2, "right": 7 } }
  },
  "materials": {},
  "part_materials": {},
  "roots": [
    { "root": 8, "material": "default" }
  ]
}