{
  "question": "What filament should I use for a strong part?",
  "slug": "strength",
  "useCase": "strength",
  "useCaseLabel": "Strength",
  "updated": "2026-10-14",
  "shortAnswer": "For a strong functional part, use carbon-fiber nylon if the printer can reach the listed nozzle temperature and the nozzle can take an abrasive filament; otherwise use PETG or an impact-modified PLA, and do not pick ordinary PLA for a part that will be hit or heated.",
  "recommendedMaterials": [
    "pa-cf",
    "petg",
    "pla",
    "pla-plus"
  ],
  "printerConsiderations": [
    "PA6-CF needs a nozzle temperature in the range the product page lists, and a nozzle that can survive fiber. Read both pages before calling it compatible.",
    "PETG wants a heated bed. Prusa’s PETG article uses about 85 °C as the bed example; the table shows the spool’s own listed bed, which may differ.",
    "Strength is also walls, infill, and layer direction. A filament change does not fix a part printed with two walls along the stress."
  ],
  "pros": [
    "The top row is a fiber-filled nylon with a datasheet, which is the material class Prusa groups with composites.",
    "PETG and PolyMax PLA give a strong-enough part on printers that cannot run nylon."
  ],
  "cons": [
    "This catalog has no tensile strength and no price per kilogram. The table will not pretend otherwise.",
    "PLA+ from one brand is not the same formula as PLA+ from another. The eSUN row is that product, not a universal grade."
  ],
  "community": "Asked how big the jump is, r/3Dprinting describes PLA as fine for light-duty parts, PETG as the more durable everyday material, and TPU as the impact-resistant one that is flexible rather than rigid. Fiber-filled nylon is what people move to when a bracket has to be both stiff and hot, which is a different request from ‘stronger PLA.’",
  "related": [
    "cf",
    "nylon",
    "heat",
    "beginners"
  ],
  "faq": [
    {
      "q": "Is PolyMax PLA as strong as nylon?",
      "a": "No. It is ranked as the easy indoor PLA that is tougher than a brittle plain PLA. Heat and a real structural load still point at PETG or PA6-CF."
    },
    {
      "q": "Why is TPU not on this list?",
      "a": "TPU survives impact by bending. The flexible guide covers it. A stiff bracket is a different part."
    }
  ],
  "sources": [
    {
      "title": "PETG, Prusa Knowledge Base",
      "url": "https://help.prusa3d.com/article/petg_2059",
      "kind": "manufacturer"
    },
    {
      "title": "PLA, Prusa Knowledge Base",
      "url": "https://help.prusa3d.com/article/pla_2062",
      "kind": "manufacturer"
    },
    {
      "title": "Prusa filament material guide",
      "url": "https://help.prusa3d.com/filament-material-guide",
      "kind": "manufacturer"
    },
    {
      "title": "Bambu Lab PA6-CF technical data sheet",
      "url": "https://cdn.shopify.com/s/files/1/0651/1555/4032/files/Bambu_PA6-CF_Technical_Data_Sheet-v2.pdf",
      "kind": "datasheet"
    },
    {
      "title": "Prusament PETG technical data sheet",
      "url": "https://www.prusa3d.com/file/3464616/prusament-petg-technical-data-sheet.pdf",
      "kind": "datasheet"
    },
    {
      "title": "How big is the jump between PLA, PETG, and TPU?, r/3Dprinting",
      "url": "https://www.reddit.com/r/3Dprinting/comments/1vawdav/how_big_of_a_difference_is_the_jump_between_pla/",
      "kind": "reddit"
    }
  ],
  "recommendations": [
    {
      "rank": 1,
      "note": "The structural step up. Datasheet linked from the record. Check the hardened-nozzle cell before buying it for a brass nozzle.",
      "brand": "Bambu Lab",
      "product": "PA6-CF",
      "material": "PA/CF",
      "url": "/brand/bambu-lab/pa6-cf",
      "nozzle": "250–290 °C",
      "bed": "80–100 °C",
      "pricePerKg": null,
      "datasheetUrl": "https://cdn.shopify.com/s/files/1/0651/1555/4032/files/Bambu_PA6-CF_Technical_Data_Sheet-v2.pdf",
      "affiliateUrl": null
    },
    {
      "rank": 2,
      "note": "Prusa calls PETG tenacious and uses that class for mechanical parts. Easier than nylon, and the record has a datasheet.",
      "brand": "Prusament",
      "product": "PETG",
      "material": "PETG",
      "url": "/brand/prusament/petg",
      "nozzle": "240–260 °C",
      "bed": "70–90 °C",
      "pricePerKg": null,
      "datasheetUrl": "https://www.prusa3d.com/file/3464616/prusament-petg-technical-data-sheet.pdf",
      "affiliateUrl": null
    },
    {
      "rank": 3,
      "note": "An impact-modified PLA, still PLA. Useful when the part is indoors and the printer is open. It does not change Prusa’s warning about PLA and heat.",
      "brand": "Polymaker",
      "product": "PolyMax PLA",
      "material": "PLA",
      "url": "/brand/polymaker/polymax-pla",
      "nozzle": "190–230 °C",
      "bed": "25–60 °C",
      "pricePerKg": null,
      "datasheetUrl": "https://cdn.shopify.com/s/files/1/0548/7299/7945/files/PolyMax_PLA_TDS_EN_V5.4.pdf",
      "affiliateUrl": null
    },
    {
      "rank": 4,
      "note": "The PLA+ people name when they want a tougher easy filament. Ranked last because ‘plus’ is not a measured strength in this catalog.",
      "brand": "eSUN 3D",
      "product": "PLA+",
      "material": "PLA+",
      "url": "/brand/esun-3d/pla-plus",
      "nozzle": "190–230 °C",
      "bed": "50–70 °C",
      "pricePerKg": null,
      "datasheetUrl": null,
      "affiliateUrl": null
    }
  ]
}