{
 "version": "2026-10-20",
 "license": "Dimension sheets are written by Xem Studio from the cited sources and are free to use (CC BY 4.0, attribute 'Xem Studio'). Linked files belong to their publishers under the license shown; Xem Studio does not host them. 'license_verified: false' means the license shown is from memory or the publisher's page as last read and should be confirmed at the link before commercial use.",
 "slug": "list-ltd-coffee-cup",
 "name": "Build list: LTD coffee-cup engine",
 "kind": "list",
 "category": "Stirling engines",
 "group": "Guide",
 "year": null,
 "question": "What parts do I need to build a LTD coffee-cup engine?",
 "tags": [
  "list",
  "build",
  "stirling",
  "ltd",
  "long earth society"
 ],
 "aliases": [
  "ltd coffee-cup engine",
  "stirling engine parts list",
  "what do i need to build a stirling engine"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "not-scanned",
 "les": true,
 "free_files": 0,
 "url": "https://xemstudio.com/objects/list-ltd-coffee-cup/",
 "sheet_txt": "https://xemstudio.com/objects/list-ltd-coffee-cup/sheet.txt",
 "sheet": {
  "basis": "Every printed part is a free file on this site; bought items named with quantities",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Runs on a cup of coffee: wide thin displacer, tiny piston.",
   "Numbers: Ø100 chamber · Ø96 × 8 foam displacer at 6 mm · 10 mL syringe at 5 mm · 1–3 Hz on 15–20 K"
  ],
  "table": {
   "columns": [
    "subsystem",
    "object",
    "parts",
    "qty",
    "print_or_buy",
    "note"
   ],
   "rows": [
    [
     "Plates",
     "ltd-coffee-cup-engine-kit",
     "ltd-100-bottom-plate-template, ltd-100-top-plate-syringe",
     1,
     "buy",
     "bottom plate in 2 mm aluminium"
    ],
    [
     "Chamber",
     "ltd-coffee-cup-engine-kit",
     "ltd-100-chamber-ring-h16",
     1,
     "print",
     "silicone seal"
    ],
    [
     "Displacer",
     "ltd-coffee-cup-engine-kit",
     "ltd-100-displacer-foam-template",
     1,
     "print",
     "EVA foam"
    ],
    [
     "Guide + rod",
     "brass-tube-ks",
     "brass-3mm, brass-2mm",
     1,
     "buy",
     "3 mm tube guide (2.1 ID) pressed in the top plate; 2 mm rod"
    ],
    [
     "Power piston",
     "syringe-pistons",
     "syringe-piston-10ml-f008",
     1,
     "print",
     "replaces the plunger; lap into the barrel, run dry"
    ],
    [
     "Syringe barrel",
     "plastic-syringes",
     "syringe-10ml",
     1,
     "buy",
     "barrel only, in the top plate socket"
    ],
    [
     "Stands",
     "ltd-coffee-cup-engine-kit",
     "ltd-crank-stand-pair",
     2,
     "print",
     ""
    ],
    [
     "Bearings",
     "ball-bearings-metric",
     "bearing-623",
     4,
     "buy",
     ""
    ],
    [
     "Crank",
     "stirling-linkage-fittings",
     "crank-disc-b3-stroke10",
     2,
     "print",
     "Ø3 bore for the Ø3 shaft in the 623 stands; M3 grub"
    ],
    [
     "Con-rods",
     "ross-yoke-kit",
     "conrod-45",
     2,
     "print",
     "Ø3.2 plain ends; one to the piston fork, one to the displacer rod"
    ],
    [
     "Pins",
     "dowel-pins-metric",
     "dowel-3x12",
     2,
     "buy",
     "crank pin + piston pin"
    ],
    [
     "Shaft",
     "stirling-shafts-and-rods",
     "crankshaft-3x80",
     1,
     "print",
     "Ø3; steel drill rod for running"
    ],
    [
     "Flywheel",
     "nut-weighted-flywheels",
     "flywheel-100-m8-b3",
     1,
     "print",
     "Ø3 hub; start with 6 M8 nuts in alternate pockets, add until it carries"
    ]
   ]
  }
 },
 "sheet_text": "Build list: LTD coffee-cup engine — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/list-ltd-coffee-cup/  (CC BY 4.0)\nBasis: Every printed part is a free file on this site; bought items named with quantities\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Runs on a cup of coffee: wide thin displacer, tiny piston.\n- Numbers: Ø100 chamber · Ø96 × 8 foam displacer at 6 mm · 10 mL syringe at 5 mm · 1–3 Hz on 15–20 K\n\nsubsystem  object  parts  qty  print_or_buy  note\nPlates  ltd-coffee-cup-engine-kit  ltd-100-bottom-plate-template, ltd-100-top-plate-syringe  1  buy  bottom plate in 2 mm aluminium\nChamber  ltd-coffee-cup-engine-kit  ltd-100-chamber-ring-h16  1  print  silicone seal\nDisplacer  ltd-coffee-cup-engine-kit  ltd-100-displacer-foam-template  1  print  EVA foam\nGuide + rod  brass-tube-ks  brass-3mm, brass-2mm  1  buy  3 mm tube guide (2.1 ID) pressed in the top plate; 2 mm rod\nPower piston  syringe-pistons  syringe-piston-10ml-f008  1  print  replaces the plunger; lap into the barrel, run dry\nSyringe barrel  plastic-syringes  syringe-10ml  1  buy  barrel only, in the top plate socket\nStands  ltd-coffee-cup-engine-kit  ltd-crank-stand-pair  2  print  \nBearings  ball-bearings-metric  bearing-623  4  buy  \nCrank  stirling-linkage-fittings  crank-disc-b3-stroke10  2  print  Ø3 bore for the Ø3 shaft in the 623 stands; M3 grub\nCon-rods  ross-yoke-kit  conrod-45  2  print  Ø3.2 plain ends; one to the piston fork, one to the displacer rod\nPins  dowel-pins-metric  dowel-3x12  2  buy  crank pin + piston pin\nShaft  stirling-shafts-and-rods  crankshaft-3x80  1  print  Ø3; steel drill rod for running\nFlywheel  nut-weighted-flywheels  flywheel-100-m8-b3  1  print  Ø3 hub; start with 6 M8 nuts in alternate pockets, add until it carries\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Long Earth Society: Engine builds — web, video — LES site — https://longearthsociety.com/engineering/\n\nXem Studio scan: not planned; the official CAD above covers it.\nAPI: https://xemstudio.com/api/geometry?object=list-ltd-coffee-cup\n",
 "sources": [
  {
   "publisher": "Long Earth Society",
   "title": "Engine builds",
   "url": "https://longearthsociety.com/engineering/",
   "formats": [
    "web",
    "video"
   ],
   "license": "LES site",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "not-scanned",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "ltd-coffee-cup-engine-kit",
  "brass-tube-ks",
  "syringe-pistons",
  "plastic-syringes",
  "ball-bearings-metric",
  "stirling-linkage-fittings",
  "ross-yoke-kit",
  "dowel-pins-metric",
  "stirling-shafts-and-rods",
  "nut-weighted-flywheels"
 ],
 "fits": [],
 "faq": [
  {
   "q": "What parts do I need to build a LTD coffee-cup engine?",
   "a": "8 printed parts (all free here) and 5 bought items; see the table and build order on this page."
  },
  {
   "q": "How do I download every STL for this build at once?",
   "a": "The stl-list.txt on this page lists every printed part's STL URL; paste it into a download script or your slicer's import."
  }
 ],
 "files_license": null,
 "offers": [],
 "markdown": "https://xemstudio.com/objects/list-ltd-coffee-cup/index.md"
}