{
 "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": "t-slot-covers",
 "name": "Snap-in slot covers for 20, 30, 40 and 10-series extrusion (100 mm)",
 "kind": "hardware",
 "category": "Hardware",
 "group": "Framing",
 "year": null,
 "question": "How do I cover the slot of 2020 extrusion?",
 "tags": [
  "slot cover",
  "extrusion",
  "2020",
  "t-slot",
  "cable management",
  "stirling",
  "long earth society"
 ],
 "aliases": [
  "t slot cover 3d print",
  "2020 slot cover stl",
  "extrusion slot filler",
  "3030 slot cover",
  "2020 slot cover strip"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": true,
 "free_files": 4,
 "url": "https://xemstudio.com/objects/t-slot-covers/",
 "sheet_txt": "https://xemstudio.com/objects/t-slot-covers/sheet.txt",
 "sheet": {
  "basis": "Stem = slot opening × lip (exact), snap barb = opening + 1.2 (designed), cap = opening + 2.4 wide",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Each cover is 100 mm long: a 1.2 mm thick cap 2.4 mm wider than the opening, a stem the slot opening wide by the lip thick, and a 1 mm snap barb 1.2 mm wider than the opening (0.6 mm each side, designed) that springs behind the lips.",
   "20-series: cap 8.4, stem 6 × 1.8, barb 7.2. 30-series: cap 10.4, stem 8 × 2.5, barb 9.2. 40-series: cap 10.4, stem 8 × 3, barb 9.2. 10-series: cap 8.9, stem 6.5 × 2.3, barb 7.7.",
   "Covers hide wiring in the slot and keep debris out."
  ],
  "table": {
   "columns": [
    "series",
    "cap_mm",
    "stem_mm",
    "barb_mm",
    "length_mm"
   ],
   "rows": [
    [
     "20",
     8.4,
     "6 × 1.8",
     7.2,
     100
    ],
    [
     "30",
     10.4,
     "8 × 2.5",
     9.2,
     100
    ],
    [
     "40",
     10.4,
     "8 × 3",
     9.2,
     100
    ],
    [
     "10 (1 in)",
     8.9,
     "6.5 × 2.3",
     7.7,
     100
    ]
   ]
  }
 },
 "sheet_text": "Snap-in slot covers for 20, 30, 40 and 10-series extrusion (100 mm) — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/t-slot-covers/  (CC BY 4.0)\nBasis: Stem = slot opening × lip (exact), snap barb = opening + 1.2 (designed), cap = opening + 2.4 wide\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Each cover is 100 mm long: a 1.2 mm thick cap 2.4 mm wider than the opening, a stem the slot opening wide by the lip thick, and a 1 mm snap barb 1.2 mm wider than the opening (0.6 mm each side, designed) that springs behind the lips.\n- 20-series: cap 8.4, stem 6 × 1.8, barb 7.2. 30-series: cap 10.4, stem 8 × 2.5, barb 9.2. 40-series: cap 10.4, stem 8 × 3, barb 9.2. 10-series: cap 8.9, stem 6.5 × 2.3, barb 7.7.\n- Covers hide wiring in the slot and keep debris out.\n\nseries  cap_mm  stem_mm  barb_mm  length_mm\n20  8.4  6 × 1.8  7.2  100\n30  10.4  8 × 2.5  9.2  100\n40  10.4  8 × 3  9.2  100\n10 (1 in)  8.9  6.5 × 2.3  7.7  100\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Wikipedia: T-slot nut — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/T-slot_nut\n- OpenBuilds: Tee nuts and brackets for V-slot — web, STEP — OpenBuilds site [verify license at link] — https://openbuildspartstore.com/\n- Long Earth Society: Engine and rig builds on extrusion frames — web, video — LES site — https://longearthsociety.com/engineering/\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 4 parts): https://xemstudio.com/files/hardware/t-slot-covers/index.json\nAPI: https://xemstudio.com/api/geometry?object=t-slot-covers\n",
 "sources": [
  {
   "publisher": "Wikipedia",
   "title": "T-slot nut",
   "url": "https://en.wikipedia.org/wiki/T-slot_nut",
   "formats": [
    "web"
   ],
   "license": "CC BY-SA 4.0 (text)",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "OpenBuilds",
   "title": "Tee nuts and brackets for V-slot",
   "url": "https://openbuildspartstore.com/",
   "formats": [
    "web",
    "STEP"
   ],
   "license": "OpenBuilds site",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "Long Earth Society",
   "title": "Engine and rig builds on extrusion frames",
   "url": "https://longearthsociety.com/engineering/",
   "formats": [
    "web",
    "video"
   ],
   "license": "LES site",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "slide-in-t-nuts",
  "t-slot-end-caps",
  "t-slot-extrusions",
  "2020-extrusion",
  "button-head-screws-metric"
 ],
 "fits": [
  {
   "role": "Goes in or on",
   "items": [
    {
     "slug": "t-slot-extrusions",
     "why": "stem in the slot opening, barb behind the lips"
    }
   ]
  },
  {
   "role": "Also needed",
   "items": [
    {
     "slug": "t-slot-end-caps",
     "why": "closes the profile ends"
    }
   ]
  }
 ],
 "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": [
  {
   "feature": "bracket / gusset / plate screw holes",
   "exact": "Ø5.5 / 6.6 / 9.0 / 7.14",
   "mates": "M5 / M6 / M8 / 1/4-20 clearance",
   "fit": "designed",
   "files": "all"
  },
  {
   "feature": "slot-cover stem",
   "exact": "slot opening × lip",
   "mates": "slot opening",
   "fit": "slide",
   "files": "slot-cover-"
  },
  {
   "feature": "slot-cover barb",
   "exact": "opening + 1.2",
   "mates": "snaps behind the lips",
   "fit": "designed",
   "files": "slot-cover-"
  }
 ],
 "fit_classes": {
  "press": "stays put: pin, tube, bearing or magnet held by interference. Typical FDM: hole +0.0 to +0.1 mm on diameter.",
  "slide": "assembles by hand and is held by a grub, pinch or clamp: shaft in a hub, rod in a socket, spigot in a bore. Typical FDM: +0.2 mm.",
  "run": "turns or slides in use: pin in a link, rod through a guide. Typical FDM: +0.3 mm.",
  "socket": "large sliding fit: syringe barrel, sleeve, bobbin in a bore. Typical FDM: +0.3 mm.",
  "clamp": "split part that closes on the mating part with screws: make it at size.",
  "designed": "a gap that is part of the design (piston fit option, displacer gap, air gap): do not change."
 },
 "faq": [
  {
   "q": "How wide is a 2020 slot cover?",
   "a": "The stem is 6.0 mm (the opening), the cap 8.4 mm and the barb 7.2 mm."
  },
  {
   "q": "Can I make it longer?",
   "a": "The file is 100 mm; the section is constant, so it can be extended to any length in CAD."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "slot-cover-20-100",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/slot-cover-20-100.step",
   "stl": "https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/slot-cover-20-100.stl",
   "note": "20-series snap-in slot cover, 100 mm: stem 6 wide (the slot opening, exact) with a snap barb"
  },
  {
   "file": "slot-cover-30-100",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/slot-cover-30-100.step",
   "stl": "https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/slot-cover-30-100.stl",
   "note": "30-series snap-in slot cover, 100 mm: stem 8 wide (the slot opening, exact) with a snap barb"
  },
  {
   "file": "slot-cover-40-100",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/slot-cover-40-100.step",
   "stl": "https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/slot-cover-40-100.stl",
   "note": "40-series snap-in slot cover, 100 mm: stem 8 wide (the slot opening, exact) with a snap barb"
  },
  {
   "file": "slot-cover-10in-100",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/slot-cover-10in-100.step",
   "stl": "https://xemstudio.com/files/hardware/t-slot-brackets-and-nuts/slot-cover-10in-100.stl",
   "note": "10in-series snap-in slot cover, 100 mm: stem 6.5 wide (the slot opening, exact) with a snap barb"
  }
 ],
 "markdown": "https://xemstudio.com/objects/t-slot-covers/index.md"
}