{
 "version": "2026-10-20",
 "license": "Dimension sheets: CC BY 4.0. Standard and published-size files: CC BY 4.0. Xem Studio's own designs (files_license = Xem Studio Design License): free to use and sell things from, not to redistribute as files — https://xemstudio.com/license/. Other publishers' files: their own license, linked beside them.",
 "slug": "print-in-place-barrel-hinge-180",
 "name": "Print-in-place: barrel hinge, three knuckles, folds 180° (48.8 mm)",
 "kind": "hardware",
 "category": "3D printing",
 "group": "Print-in-place mechanisms",
 "year": null,
 "question": "How do you 3D print a hinge already assembled?",
 "tags": [
  "3d printable",
  "print in place",
  "no assembly",
  "no supports",
  "mechanism",
  "stl",
  "step",
  "hinge"
 ],
 "aliases": [
  "print in place hinge",
  "3d printed hinge no assembly",
  "print in place barrel hinge",
  "folding hinge stl",
  "cone pin hinge"
 ],
 "overall_mm": {
  "length": 48.8,
  "width": 70,
  "height": 10
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 3,
 "url": "https://xemstudio.com/objects/print-in-place-barrel-hinge-180/",
 "sheet_txt": "https://xemstudio.com/objects/print-in-place-barrel-hinge-180/sheet.txt",
 "sheet": {
  "basis": "Xem Studio design: 45° cone pivots on a horizontal axis; one designed running gap of 0.40 mm",
  "overall_mm": {
   "length": 48.8,
   "width": 70,
   "height": 10
  },
  "notes": [
   "3D print in place — prints already assembled, moving, in one job. Drawn at true size with no printer tolerance added; the 0.40 mm running gaps are part of the design.",
   "Running gap 0.40 mm per side, 0.80 mm on diameter — part of the design, drawn as is. On the 45° faces the same 0.40 mm is measured square to the face (0.57 mm along the axis).",
   "Bed: opened flat, both leaves on the bed, the barrel axis horizontal 5 mm up. Each knuckle stands on a flat foot: below 45° the barrel's round is replaced by 45° tangents down to the bed.",
   "Support while printing: the pivots are 45° cones on the axis (the outer knuckles' cones point into sockets in the centre knuckle), and a 45° cone on a horizontal axis never overhangs more than 45°. Leaves and barrels print as plain walls.",
   "Captured by the two opposed cones: the centre knuckle sits between them, so it can neither slide along the axis nor drop out.",
   "Freeing it: hold leaf A flat and lift leaf B slowly to 90°, back, then all the way over to 180°; repeat a few times.",
   "Motion: leaf B folds 181.2° up from flat — over 180°, where the leaves lie face to face 0.8 mm apart — and 98.4° the other way; the stops are leaf on leaf (computed by turning the model)."
  ],
  "table": {
   "columns": [
    "key",
    "value",
    "what"
   ],
   "rows": [
    [
     "gap_mm",
     0.4,
     "running gap per side on every moving interface (radial, axial, under captured parts) — part of the design, not a tolerance"
    ],
    [
     "hinge_l_mm",
     48.8,
     "length along the axis"
    ],
    [
     "leaf_w_mm",
     35,
     "each leaf, from the axis"
    ],
    [
     "leaf_t_mm",
     4.6,
     "leaf thickness"
    ],
    [
     "knuckle_d_mm",
     10,
     "knuckle (barrel) diameter"
    ],
    [
     "axis_h_mm",
     5,
     "axis height above the bed"
    ],
    [
     "knuckles",
     "3 (12 + 24 + 12)",
     "outer two on leaf A, centre one on leaf B"
    ],
    [
     "pin_d_mm",
     6,
     "45° cone pivot, base diameter (one each end of the centre knuckle)"
    ],
    [
     "socket_d_mm",
     6.33,
     "cone socket at the knuckle face"
    ],
    [
     "fold_up_deg",
     181.2,
     "leaf B about the axis, from flat (drawn) to the stop"
    ],
    [
     "fold_down_deg",
     98.4,
     "the other way, from flat"
    ],
    [
     "gap_folded_mm",
     0.8,
     "between the leaves' faces at 180°"
    ],
    [
     "mount_holes",
     "2 × Ø4.5 per leaf",
     ""
    ]
   ]
  }
 },
 "sheet_text": "Print-in-place: barrel hinge, three knuckles, folds 180° (48.8 mm) — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/print-in-place-barrel-hinge-180/  (sheet CC BY 4.0; files Xem Studio Design License, https://xemstudio.com/license/)\nBasis: Xem Studio design: 45° cone pivots on a horizontal axis; one designed running gap of 0.40 mm\nCatalog version: 2026-10-20\n\nOverall (mm): length 48.8, width 70.0, height 10.0\n- 3D print in place — prints already assembled, moving, in one job. Drawn at true size with no printer tolerance added; the 0.40 mm running gaps are part of the design.\n- Running gap 0.40 mm per side, 0.80 mm on diameter — part of the design, drawn as is. On the 45° faces the same 0.40 mm is measured square to the face (0.57 mm along the axis).\n- Bed: opened flat, both leaves on the bed, the barrel axis horizontal 5 mm up. Each knuckle stands on a flat foot: below 45° the barrel's round is replaced by 45° tangents down to the bed.\n- Support while printing: the pivots are 45° cones on the axis (the outer knuckles' cones point into sockets in the centre knuckle), and a 45° cone on a horizontal axis never overhangs more than 45°. Leaves and barrels print as plain walls.\n- Captured by the two opposed cones: the centre knuckle sits between them, so it can neither slide along the axis nor drop out.\n- Freeing it: hold leaf A flat and lift leaf B slowly to 90°, back, then all the way over to 180°; repeat a few times.\n- Motion: leaf B folds 181.2° up from flat — over 180°, where the leaves lie face to face 0.8 mm apart — and 98.4° the other way; the stops are leaf on leaf (computed by turning the model).\n\nkey  value  what\ngap_mm  0.4  running gap per side on every moving interface (radial, axial, under captured parts) — part of the design, not a tolerance\nhinge_l_mm  48.8  length along the axis\nleaf_w_mm  35.0  each leaf, from the axis\nleaf_t_mm  4.6  leaf thickness\nknuckle_d_mm  10.0  knuckle (barrel) diameter\naxis_h_mm  5.0  axis height above the bed\nknuckles  3 (12 + 24 + 12)  outer two on leaf A, centre one on leaf B\npin_d_mm  6.0  45° cone pivot, base diameter (one each end of the centre knuckle)\nsocket_d_mm  6.33  cone socket at the knuckle face\nfold_up_deg  181.2  leaf B about the axis, from flat (drawn) to the stop\nfold_down_deg  98.4  the other way, from flat\ngap_folded_mm  0.8  between the leaves' faces at 180°\nmount_holes  2 × Ø4.5 per leaf  \n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Xem Studio: Print-in-place mechanism design (geometry computed in the generator) — web — Xem Studio design — https://xemstudio.com/\n\nFree files (Xem Studio Design License, Xem Studio; STEP + STL, 3 parts): https://xemstudio.com/files/hardware/print-in-place-barrel-hinge-180/index.json\nAPI: https://xemstudio.com/api/geometry?object=print-in-place-barrel-hinge-180\n",
 "sources": [
  {
   "publisher": "Xem Studio",
   "title": "Print-in-place mechanism design (geometry computed in the generator)",
   "url": "https://xemstudio.com/",
   "formats": [
    "web"
   ],
   "license": "Xem Studio design",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "print-in-place-captive-wheel-axle",
  "print-in-place-multi-knuckle-hinge",
  "print-in-place-captive-turntable",
  "print-in-place-dovetail-slider",
  "print-in-place-articulated-chain",
  "print-in-place-ball-joint",
  "print-in-place-push-button-flexure"
 ],
 "fits": [],
 "dimensions": "exact (nominal, no printing tolerance)",
 "dimension_rule": "All geometry on Xem Studio is exact (nominal, true size) with no printing tolerance. Where a part meets another part, the object lists its mating features (feature, exact size, what it mates with, fit class: press, slide, run, socket, clamp or designed). Apply your process's allowance to those features only; 'designed' gaps are part of the design and stay as drawn.",
 "mating": [],
 "faq": [
  {
   "q": "What is the pin of a print-in-place hinge?",
   "a": "There is no separate pin: each outer knuckle carries a 45° cone (Ø6 base) that runs in a cone socket of the centre knuckle, 0.40 mm clear square to the cone."
  },
  {
   "q": "Does it fold flat?",
   "a": "Yes: at 180° the leaves lie face to face, 0.8 mm apart; the knuckles are 10 mm in diameter on 4.6 mm leaves."
  }
 ],
 "files_license": {
  "name": "Xem Studio Design License",
  "holder": "Xem Studio",
  "url": "https://xemstudio.com/license/",
  "note": "Xem Studio's own design: free to use, print, modify and sell things made from it; not to be republished or redistributed as files."
 },
 "offers": [
  {
   "file": "print-in-place-barrel-hinge-180-assembly",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "Xem Studio Design License",
   "step": "https://xemstudio.com/files/hardware/print-in-place-barrel-hinge-180/print-in-place-barrel-hinge-180-assembly.step",
   "stl": "https://xemstudio.com/files/hardware/print-in-place-barrel-hinge-180/print-in-place-barrel-hinge-180-assembly.stl",
   "note": "The whole print as laid on the bed (2 bodies, already assembled); STEP keeps each moving body a separate solid"
  },
  {
   "file": "print-in-place-barrel-hinge-180-leaf-a",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "Xem Studio Design License",
   "step": "https://xemstudio.com/files/hardware/print-in-place-barrel-hinge-180/print-in-place-barrel-hinge-180-leaf-a.step",
   "stl": "https://xemstudio.com/files/hardware/print-in-place-barrel-hinge-180/print-in-place-barrel-hinge-180-leaf-a.stl",
   "note": "Leaf A with the two outer knuckles and the two 45° cone pivots"
  },
  {
   "file": "print-in-place-barrel-hinge-180-leaf-b",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "Xem Studio Design License",
   "step": "https://xemstudio.com/files/hardware/print-in-place-barrel-hinge-180/print-in-place-barrel-hinge-180-leaf-b.step",
   "stl": "https://xemstudio.com/files/hardware/print-in-place-barrel-hinge-180/print-in-place-barrel-hinge-180-leaf-b.stl",
   "note": "Leaf B with the centre knuckle and its two cone sockets"
  }
 ],
 "markdown": "https://xemstudio.com/objects/print-in-place-barrel-hinge-180/index.md"
}