{
  "opening": "These comments do not show a knot forming on a spool. One pair argues about PETG squish versus PLA. Another says TPU is a limp noodle in a Bowden tube.",
  "question": "Why does my filament tangle / knot on the spool?",
  "slug": "tangle",
  "useCase": "troubleshooting",
  "useCaseLabel": "Troubleshooting",
  "updated": "2026-10-23",
  "shortAnswer": "These comments do not show a knot forming on a spool. One pair argues about PETG squish versus PLA. Another says TPU is a limp noodle in a Bowden tube.",
  "recommendedMaterials": [
    "pla",
    "petg",
    "tpu"
  ],
  "printerConsiderations": [
    "A Bowden tube plus soft filament is the score-12 comment. It is a feed problem. It is not a knot that was wound into the spool at the factory.",
    "The score-5 PETG comment gives a Z offset 0.05–0.09 mm higher than PLA. That is the comment's millimetres, not a cell in this catalog.",
    "Letting the free end go slack is the usual tangle story. These five threads did not supply a comment that says that."
  ],
  "pros": [
    "The page separates a spool knot from a first-layer argument and a Bowden jam.",
    "The title is labeled as a title."
  ],
  "cons": [
    "No comments describes the winding, the moment the end was released, or a brand that does not knot."
  ],
  "community": "The editorial summary says real tangles come from loose winding when the end is released, and that knots rarely occur in good brands. That sentence is not in the excerpts. r/FixMyPrint 1bi2bsn, score 7, notes that two posts say PETG likes more squish than PLA and two say the opposite. Score 5 says PETG needs a higher Z offset than PLA, does not like more squish, and to expect PETG 0.05–0.09 mm higher than PLA. The excerpt is cut off after that. r/FixMyPrint 11uamyy, score 12, says pushing a limp noodle through a Bowden setup takes tweaking, and to slow down and ease extruder tension. Score 5 asks for the print speed and gives none. No excerpt was supplied for r/BambuLab 1ltblc4, r/3Dprinting t8b5o0, or r/prusa3d 1j1737e.",
  "related": [
    "filament_runout",
    "clog",
    "ams"
  ],
  "faq": [
    {
      "q": "Why does my filament tangle / knot on the spool?",
      "a": "These comments do not show a knot forming on a spool. One pair argues about PETG squish versus PLA. Another says TPU is a limp noodle in a Bowden tube."
    },
    {
      "q": "Does a higher PETG Z offset stop a knot?",
      "a": "No. The score-5 comment on r/FixMyPrint is about first-layer squish. It says to expect PETG 0.05–0.09 mm higher than PLA. A knot on the spool is a different failure, and that comment does not describe one."
    },
    {
      "q": "Is Hatchbox prone to internal tangles?",
      "a": "The product page checked 19 October 2026 lists 180–220 °C (356–428 °F) and a bed of 50–70 °C (122–158 °F). It does not list a tangle rate."
    }
  ],
  "sources": [
    {
      "title": "Hatchbox PLA product page",
      "url": "https://www.hatchbox3d.com/products/3d-pla-1kg1-75-blu",
      "kind": "manufacturer"
    },
    {
      "title": "Polymaker PolyLite PETG technical data sheet",
      "url": "https://cdn.shopify.com/s/files/1/0548/7299/7945/files/PolyLite_PETG_TDS_EN_V5.4.pdf",
      "kind": "datasheet"
    },
    {
      "title": "Bambu Lab TPU 90A technical data sheet",
      "url": "https://cdn.shopify.com/s/files/1/0645/5876/0155/files/Bambu_TPU_90A_Technical_Data_Sheet_582bf8f6-1f0a-474c-aeda-9e72af3689dc.pdf",
      "kind": "datasheet"
    },
    {
      "title": "Community source, r/BambuLab 1ltblc4",
      "url": "https://www.reddit.com/r/BambuLab/comments/1ltblc4/",
      "kind": "reddit"
    },
    {
      "title": "Community source, r/FixMyPrint 1bi2bsn",
      "url": "https://www.reddit.com/r/FixMyPrint/comments/1bi2bsn/",
      "kind": "reddit"
    },
    {
      "title": "Community source, r/FixMyPrint 11uamyy",
      "url": "https://www.reddit.com/r/FixMyPrint/comments/11uamyy/",
      "kind": "reddit"
    },
    {
      "title": "Community source, r/3Dprinting t8b5o0",
      "url": "https://www.reddit.com/r/3Dprinting/comments/t8b5o0/",
      "kind": "reddit"
    },
    {
      "title": "Community source, r/prusa3d 1j1737e",
      "url": "https://www.reddit.com/r/prusa3d/comments/1j1737e/",
      "kind": "reddit"
    }
  ],
  "recommendations": [
    {
      "rank": 1,
      "note": "Hatchbox product page checked 19 October 2026 lists a nozzle of 180–220 °C (356–428 °F) and a bed of 50–70 °C (122–158 °F). This row is not a tangle rate.",
      "brand": "Hatchbox",
      "product": "PLA",
      "material": "PLA",
      "url": "/brand/hatchbox/pla",
      "nozzle": "180–220 °C (356–428 °F)",
      "bed": "50–70 °C (122–158 °F)",
      "pricePerKg": null,
      "datasheetUrl": null,
      "affiliateUrl": null
    },
    {
      "rank": 2,
      "note": "PolyLite PETG technical data sheet, drying checked 18 October 2026, lists a nozzle of 220–250 °C (428–482 °F), a bed of 70–90 °C (158–194 °F), and drying at 65 °C (149 °F) for 6 h. The PETG comments are about Z offset, not about this spool.",
      "brand": "Polymaker",
      "product": "Polylite PETG",
      "material": "PETG",
      "url": "/brand/polymaker/polylite-petg",
      "nozzle": "220–250 °C (428–482 °F)",
      "bed": "70–90 °C (158–194 °F)",
      "pricePerKg": null,
      "datasheetUrl": "https://cdn.shopify.com/s/files/1/0548/7299/7945/files/PolyLite_PETG_TDS_EN_V5.4.pdf",
      "affiliateUrl": null
    },
    {
      "rank": 3,
      "note": "Bambu TPU 90A technical data sheet, drying checked 18 October 2026, lists a nozzle of 200–250 °C (392–482 °F), a bed of 30–35 °C (86–95 °F), shore 90 in this catalog, and drying at 70 °C (158 °F) for 8 h. The Bowden comment does not name this spool.",
      "brand": "Bambu Lab",
      "product": "TPU 90A",
      "material": "TPU",
      "url": "/brand/bambu-lab/tpu-90a",
      "nozzle": "200–250 °C (392–482 °F)",
      "bed": "30–35 °C (86–95 °F)",
      "pricePerKg": null,
      "datasheetUrl": "https://cdn.shopify.com/s/files/1/0645/5876/0155/files/Bambu_TPU_90A_Technical_Data_Sheet_582bf8f6-1f0a-474c-aeda-9e72af3689dc.pdf",
      "affiliateUrl": null
    }
  ]
}