{
 "object": "free-piston-displacer",
 "license": "CC BY 4.0, Xem Studio",
 "les": "https://longearthsociety.com/engineering/",
 "files": [
  {
   "name": "displacer-30x75",
   "step": "/files/hardware/free-piston-core/displacer-30x75.step",
   "stl": "/files/hardware/free-piston-core/displacer-30x75.stl",
   "note": "displacer Ø29 (0.5 mm radial gap in a Ø30 bore) × 75, hollow 1.2 wall, Ø5 rod boss"
  },
  {
   "name": "displacer-40x100",
   "step": "/files/hardware/free-piston-core/displacer-40x100.step",
   "stl": "/files/hardware/free-piston-core/displacer-40x100.stl",
   "note": "displacer Ø39 (0.5 mm radial gap in a Ø40 bore) × 100, hollow 1.2 wall, Ø5 rod boss"
  }
 ]
}