{
 "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-thermoacoustic-2in",
 "name": "Build list: Thermoacoustic standing-wave engine, 2 in spools",
 "kind": "list",
 "category": "Stirling engines",
 "group": "Guide",
 "year": null,
 "question": "What parts do I need to build a Thermoacoustic standing-wave engine, 2 in spools?",
 "tags": [
  "list",
  "build",
  "stirling",
  "thermoacoustic",
  "long earth society"
 ],
 "aliases": [
  "thermoacoustic standing-wave engine, 2 in spools",
  "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-thermoacoustic-2in/",
 "sheet_txt": "https://xemstudio.com/objects/list-thermoacoustic-2in/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": [
   "No pistons: a printed stack in a λ/4 tube of spools; a speaker turns the sound into electricity.",
   "Numbers: 2 in × 6 in + 2 in × 12 in spools ≈ 470 mm closed-open → ~180 Hz · stack 40 mm at ~60 mm from the hot end · 1.3 mm cells (60% honeycomb infill)"
  ],
  "table": {
   "columns": [
    "subsystem",
    "object",
    "parts",
    "qty",
    "print_or_buy",
    "note"
   ],
   "rows": [
    [
     "Hot end",
     "tri-clamp-end-cap",
     "tc-cap-2in-flat",
     1,
     "print",
     "flame or nichrome coil"
    ],
    [
     "Spools",
     "tri-clamp-spool",
     "tc-spool-2in-6in, tc-spool-2in-12in",
     2,
     "buy",
     "stainless"
    ],
    [
     "Joints",
     "tri-clamp-end-cap",
     "tc-gasket-2in",
     3,
     "buy",
     "ISO 2852 Type B gaskets on the cold joints"
    ],
    [
     "Clamps",
     "tri-clamp-clamps",
     "clamp-half-2in",
     6,
     "print",
     "two halves per joint; stainless clamp at the flame side"
    ],
    [
     "Stack",
     "thermoacoustic-stacks-and-resonators",
     "stack-blank-2in-40",
     1,
     "print",
     "honeycomb infill = the stack"
    ],
    [
     "Heat exchangers",
     "copper-pipe-type-l-m",
     "copper-2in-typeL-50mm",
     2,
     "buy",
     "copper stubs / mesh on both stack faces"
    ],
    [
     "Cold side",
     "regenerator-and-heat-materials",
     "ceramic-standoff-10x20",
     2,
     "print",
     "standoffs + water jacket or fins"
    ],
    [
     "Driver / load",
     "thermoacoustic-stacks-and-resonators",
     "driver-cap-2in-40mm-speaker",
     1,
     "buy",
     "40 mm speaker"
    ],
    [
     "Speaker",
     "adafruit-audio-speakers-mics",
     "3968-speaker-40mm",
     1,
     "buy",
     "40 mm 4 Ω"
    ],
    [
     "Instruments",
     "instrument-mounts",
     "probe-clamp-k-type-3mm, probe-clamp-ds18b20-6mm",
     2,
     "print",
     "hot / cold temperatures"
    ],
    [
     "Insulation",
     "regenerator-and-heat-materials",
     "firebrick-230x114x64",
     1,
     "buy",
     "under the burner"
    ],
    [
     "Stand",
     "spool-hanger-collars",
     "hanger-2in-tab, hanger-2in-plain",
     2,
     "print",
     "two collars on the resonator, cold side"
    ],
    [
     "Frame rails",
     "t-slot-extrusions",
     "2020-100",
     3,
     "buy",
     "uprights + crossbar"
    ]
   ]
  }
 },
 "sheet_text": "Build list: Thermoacoustic standing-wave engine, 2 in spools — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/list-thermoacoustic-2in/  (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- No pistons: a printed stack in a λ/4 tube of spools; a speaker turns the sound into electricity.\n- Numbers: 2 in × 6 in + 2 in × 12 in spools ≈ 470 mm closed-open → ~180 Hz · stack 40 mm at ~60 mm from the hot end · 1.3 mm cells (60% honeycomb infill)\n\nsubsystem  object  parts  qty  print_or_buy  note\nHot end  tri-clamp-end-cap  tc-cap-2in-flat  1  print  flame or nichrome coil\nSpools  tri-clamp-spool  tc-spool-2in-6in, tc-spool-2in-12in  2  buy  stainless\nJoints  tri-clamp-end-cap  tc-gasket-2in  3  buy  ISO 2852 Type B gaskets on the cold joints\nClamps  tri-clamp-clamps  clamp-half-2in  6  print  two halves per joint; stainless clamp at the flame side\nStack  thermoacoustic-stacks-and-resonators  stack-blank-2in-40  1  print  honeycomb infill = the stack\nHeat exchangers  copper-pipe-type-l-m  copper-2in-typeL-50mm  2  buy  copper stubs / mesh on both stack faces\nCold side  regenerator-and-heat-materials  ceramic-standoff-10x20  2  print  standoffs + water jacket or fins\nDriver / load  thermoacoustic-stacks-and-resonators  driver-cap-2in-40mm-speaker  1  buy  40 mm speaker\nSpeaker  adafruit-audio-speakers-mics  3968-speaker-40mm  1  buy  40 mm 4 Ω\nInstruments  instrument-mounts  probe-clamp-k-type-3mm, probe-clamp-ds18b20-6mm  2  print  hot / cold temperatures\nInsulation  regenerator-and-heat-materials  firebrick-230x114x64  1  buy  under the burner\nStand  spool-hanger-collars  hanger-2in-tab, hanger-2in-plain  2  print  two collars on the resonator, cold side\nFrame rails  t-slot-extrusions  2020-100  3  buy  uprights + crossbar\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-thermoacoustic-2in\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": [
  "tri-clamp-end-cap",
  "tri-clamp-spool",
  "tri-clamp-clamps",
  "thermoacoustic-stacks-and-resonators",
  "copper-pipe-type-l-m",
  "regenerator-and-heat-materials",
  "adafruit-audio-speakers-mics",
  "instrument-mounts",
  "spool-hanger-collars",
  "t-slot-extrusions"
 ],
 "fits": [],
 "faq": [
  {
   "q": "What parts do I need to build a Thermoacoustic standing-wave engine, 2 in spools?",
   "a": "8 printed parts (all free here) and 7 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-thermoacoustic-2in/index.md"
}