{
  "opening": "Two medical ABS sheets state 24 months when that product is stored as the sheet describes. This catalog has no shelf-life field on filament rows. That is not a PLA expiry, and the comments here do not measure how long a spool lasts.",
  "question": "How long does filament last / does it go bad?",
  "slug": "old_filament",
  "useCase": "drying",
  "useCaseLabel": "Drying",
  "updated": "2026-10-23",
  "shortAnswer": "This catalog has no shelf-life field on filament rows. Two medical ABS sheets state 24 months when that product is stored as the sheet describes. That is not a PLA expiry, and the comments here do not measure how long a spool lasts.",
  "recommendedMaterials": [
    "pla",
    "abs"
  ],
  "printerConsiderations": [
    "A score-3 comment says PLA prints lasted well over 5 years outside. That is a printed part in the weather. It is not a sealed-spool date.",
    "The score-24 comment says heat to 110, wait 5–10 minutes, and pull filament out of a hotend. The comment does not name a unit. It is not a drying cycle and not a shelf life.",
    "Two threads posted 22 October 2026 are titled as 10-year-old opened ABS. Each had a score of 1 and zero comments at ingest. There is no result to quote."
  ],
  "pros": [
    "Shelf life is quoted only from sheets that print a number of months, and only for those products.",
    "A printed part left outdoors is not rewritten as a spool expiry."
  ],
  "cons": [
    "Almost every other spool in the catalog, including the PLA row above, has no published life.",
    "No comments weighs a spool, dates a bag, or says the filament failed because of age alone."
  ],
  "community": "The editorial summary says filament does not really expire and that moisture is the issue, so dry it and reuse it. The excerpts do not test that. r/3Dprinting 1ew3jx5, score 3, says PLA prints have lasted well over 5 years outside and bets this light-colored part will last many years. Score 2 starts a story about outdoor light fixtures and is cut off. It gives no life number. r/ender3 1430m81, score 27, says heat it and use pliers, or purge with the next filament. Score 24 says mount it, heat to 110, wait 5–10 minutes, and pull it out. No excerpt was supplied for r/3Dprinting 1wz8bp8, r/3Dprinting 1ridhb3, or r/3Dprinting s2icz0.",
  "related": [
    "drying",
    "hygro",
    "brittle",
    "storage"
  ],
  "faq": [
    {
      "q": "How long does filament last / does it go bad?",
      "a": "Two medical ABS sheets state 24 months when that product is stored as the sheet describes. This catalog has no shelf-life field on filament rows. That is not a PLA expiry, and the comments here do not measure how long a spool lasts."
    },
    {
      "q": "Can I treat 24 months as the life of any spool?",
      "a": "No. The 24 months is on the Formfutura Premium ABS Medical sheet, with humidity below 15% and storage around 18–25 °C (64–77 °F), and on the Spectrum ABS Medical sheet, stored in a dry room around 18–25 °C (64–77 °F). Bambu PLA Basic lists a drying cycle of 50 °C (122 °F) for 8 h and no shelf life. [Wet filament](/answers/hygro) and [brittle filament](/answers/brittle) are the failure modes this catalog can actually point at."
    },
    {
      "q": "A thread says 10-year-old opened ABS. Did it print?",
      "a": "The titles on r/BambuLab and r/3Dprinting say that. Both were ingested 23 October 2026 with a score of 1 and zero comments."
    }
  ],
  "sources": [
    {
      "title": "Bambu PLA Basic technical data sheet",
      "url": "https://cdn.shopify.com/s/files/1/0584/7236/6216/files/Bambu_PLA_Basic_Technical_Data_Sheet_bf3411ce-be39-4db7-9669-1b4671d2196b.pdf?v=1734060943",
      "kind": "datasheet"
    },
    {
      "title": "Formfutura Premium ABS Medical technical data sheet",
      "url": "https://www.formfutura.com/web/content/306558?download=true",
      "kind": "datasheet"
    },
    {
      "title": "Spectrum ABS Medical technical data sheet",
      "url": "https://spectrumfilaments.com/wp-content/uploads/2021/09/en_tds_spectrum_medical.pdf",
      "kind": "datasheet"
    },
    {
      "title": "Community source, r/3Dprinting 1ew3jx5",
      "url": "https://www.reddit.com/r/3Dprinting/comments/1ew3jx5/",
      "kind": "reddit"
    },
    {
      "title": "Community source, r/3Dprinting 1wz8bp8",
      "url": "https://www.reddit.com/r/3Dprinting/comments/1wz8bp8/",
      "kind": "reddit"
    },
    {
      "title": "Community source, r/ender3 1430m81",
      "url": "https://www.reddit.com/r/ender3/comments/1430m81/",
      "kind": "reddit"
    },
    {
      "title": "Community source, r/3Dprinting 1ridhb3",
      "url": "https://www.reddit.com/r/3Dprinting/comments/1ridhb3/",
      "kind": "reddit"
    },
    {
      "title": "Community source, r/3Dprinting s2icz0",
      "url": "https://www.reddit.com/r/3Dprinting/comments/s2icz0/",
      "kind": "reddit"
    },
    {
      "title": "Community source, r/BambuLab 1xcnvd5",
      "url": "https://www.reddit.com/r/BambuLab/comments/1xcnvd5/",
      "kind": "reddit"
    },
    {
      "title": "Community source, r/3Dprinting 1xcobsb",
      "url": "https://www.reddit.com/r/3Dprinting/comments/1xcobsb/",
      "kind": "reddit"
    }
  ],
  "recommendations": [
    {
      "rank": 1,
      "note": "Technical data sheet checked 14 October 2026 lists a nozzle of 190–230 °C (374–446 °F), a bed of 35–45 °C (95–113 °F), and blast-oven drying at 50 °C (122 °F) for 8 h. The row has no shelf-life cell. It is here because the question is usually about PLA, not because the sheet dates the spool.",
      "brand": "Bambu Lab",
      "product": "PLA Basic",
      "material": "PLA",
      "url": "/brand/bambu-lab/pla-basic",
      "nozzle": "190–230 °C (374–446 °F)",
      "bed": "35–45 °C (95–113 °F)",
      "pricePerKg": null,
      "datasheetUrl": "https://cdn.shopify.com/s/files/1/0584/7236/6216/files/Bambu_PLA_Basic_Technical_Data_Sheet_bf3411ce-be39-4db7-9669-1b4671d2196b.pdf?v=1734060943",
      "affiliateUrl": null
    },
    {
      "rank": 2,
      "note": "Datasheet read 23 October 2026, date of issue 5 January 2026, says that stored properly the product has a shelf life of 24 months, at about 18–25 °C (64–77 °F), dry, dark, and below 15% humidity. Nozzle on the sheet is 235–260 °C (455–500 °F). This is that ABS sheet, not a general filament rule, and not a reason to print a device.",
      "brand": "FormFutura",
      "product": "Premium ABS Medical",
      "material": "ABS",
      "url": "/brand/formfutura/premium-abs-medical",
      "nozzle": "235–260 °C (455–500 °F)",
      "bed": "90–110 °C (194–230 °F)",
      "pricePerKg": null,
      "datasheetUrl": "https://www.formfutura.com/web/content/306558?download=true",
      "affiliateUrl": null
    },
    {
      "rank": 3,
      "note": "Datasheet read 23 October 2026 prints preparation date 06-04-2022 and says that stored properly the product has a shelf life of 24 months, in a dry room at about 18–25 °C (64–77 °F). Nozzle 235–255 °C (455–491 °F) and bed 100 °C (212 °F). The catalog safety certifications is empty. The 24 months is this sheet's storage line.",
      "brand": "Spectrum",
      "product": "ABS Medical",
      "material": "ABS",
      "url": "/brand/spectrum/abs-medical",
      "nozzle": "235–255 °C (455–491 °F)",
      "bed": "100 °C (212 °F)",
      "pricePerKg": null,
      "datasheetUrl": "https://spectrumfilaments.com/wp-content/uploads/2021/09/en_tds_spectrum_medical.pdf",
      "affiliateUrl": null
    }
  ]
}