{
  "version": "0.1",
  "nodes": {
    "1": { "id": 1, "name": "plate_body", "op": {"type": "Cube", "size": {"x": 50, "y": 30, "z": 10}} },
    "2": { "id": 2, "name": "plate_centered", "op": {"type": "Translate", "child": 1, "offset": {"x": -25, "y": -15, "z": 0}} },

    "3": { "id": 3, "name": "hole_cyl", "op": {"type": "Cylinder", "radius": 1.5, "height": 10, "segments": 32} },
    "4": { "id": 4, "name": "hole_fl", "op": {"type": "Translate", "child": 3, "offset": {"x": -20, "y": -10, "z": 0}} },

    "5": { "id": 5, "name": "hole_cyl2", "op": {"type": "Cylinder", "radius": 1.5, "height": 10, "segments": 32} },
    "6": { "id": 6, "name": "hole_fr", "op": {"type": "Translate", "child": 5, "offset": {"x": 20, "y": -10, "z": 0}} },

    "7": { "id": 7, "name": "hole_cyl3", "op": {"type": "Cylinder", "radius": 1.5, "height": 10, "segments": 32} },
    "8": { "id": 8, "name": "hole_rl", "op": {"type": "Translate", "child": 7, "offset": {"x": -20, "y": 10, "z": 0}} },

    "9": { "id": 9, "name": "hole_cyl4", "op": {"type": "Cylinder", "radius": 1.5, "height": 10, "segments": 32} },
    "10": { "id": 10, "name": "hole_rr", "op": {"type": "Translate", "child": 9, "offset": {"x": 20, "y": 10, "z": 0}} },

    "11": { "id": 11, "name": "diff1", "op": {"type": "Difference", "left": 2, "right": 4} },
    "12": { "id": 12, "name": "diff2", "op": {"type": "Difference", "left": 11, "right": 6} },
    "13": { "id": 13, "name": "diff3", "op": {"type": "Difference", "left": 12, "right": 8} },
    "14": { "id": 14, "name": "diff4", "op": {"type": "Difference", "left": 13, "right": 10} }
  },
  "materials": {},
  "part_materials": {},
  "roots": [{ "root": 14, "material": "default" }]
}