{
  "question": "What filament should I use on a printer with no enclosure?",
  "slug": "open-printer",
  "useCase": "open-printer",
  "useCaseLabel": "Open printers",
  "updated": "2026-10-14",
  "shortAnswer": "On a printer with no enclosure, use PLA or PETG. Prusa says ASA and ABS need a hotter ambient temperature or an enclosure because they warp, and a blank enclosure field on a printer page is not evidence that the machine is enclosed.",
  "recommendedMaterials": [
    "pla",
    "petg"
  ],
  "printerConsiderations": [
    "Read the printer page. Enclosure values in this catalog are enclosed, open, optional, or not listed. Only an explicit open or a missing enclosure should push you off ASA; optional means the manufacturer sells it both ways.",
    "Prusa’s ASA article: bed at least 100 °C, enclosure or draft shield, ventilation. If the printer’s maximum bed is under 100 °C, ASA is a conflict on temperature alone.",
    "PLA in a hot enclosure can be the worse setup. Prusa’s warping note says PLA and PETG want cooling that a hot box fights."
  ],
  "pros": [
    "PLA and PETG are the materials you can recommend without inventing an enclosure the printer page does not have.",
    "The fit rules on material tables use the same idea: a missing limit is not a pass."
  ],
  "cons": [
    "An open printer cannot honestly be given the outdoor ASA recommendation. Use the outdoor guide after the printer can actually run ASA.",
    "PETG is not as forgiving as PLA. It is still the right functional filament on an open machine, and it will string while you learn it."
  ],
  "community": "Beginner threads tell an open-printer owner to stay on PLA, then try PETG. The ASA threads add the enclosure and the ventilation in the same breath. People with only an open bed who need an outdoor part are told to print PETG now and reprint in ASA later, not to run ASA on the open machine and hope.",
  "related": [
    "beginners",
    "outdoors",
    "car-interior"
  ],
  "faq": [
    {
      "q": "My printer page says enclosure is optional. Can I print ASA?",
      "a": "Only if you are using the enclosure. Optional is not the same as enclosed. Without it, stay on PLA or PETG."
    },
    {
      "q": "The enclosure cell is an em dash. What does the filter do?",
      "a": "The printer filter leaves enclosure unknown. It does not call that a fit. This guide uses the same rule."
    }
  ],
  "sources": [
    {
      "title": "ASA, Prusa Knowledge Base",
      "url": "https://help.prusa3d.com/article/asa_1809",
      "kind": "manufacturer"
    },
    {
      "title": "PLA, Prusa Knowledge Base",
      "url": "https://help.prusa3d.com/article/pla_2062",
      "kind": "manufacturer"
    },
    {
      "title": "Warping, Prusa Knowledge Base",
      "url": "https://help.prusa3d.com/article/warping_2011",
      "kind": "manufacturer"
    },
    {
      "title": "Prusament PETG technical data sheet",
      "url": "https://www.prusa3d.com/file/3464616/prusament-petg-technical-data-sheet.pdf",
      "kind": "datasheet"
    },
    {
      "title": "A good filament type for a beginner, r/3Dprinting",
      "url": "https://www.reddit.com/r/3Dprinting/comments/gokwya/a_good_filament_type_for_a_beginner/",
      "kind": "reddit"
    },
    {
      "title": "Best filaments for extended outdoor use?, r/3Dprinting",
      "url": "https://www.reddit.com/r/3Dprinting/comments/y0pceo/best_filaments_for_extended_outdoor_use/",
      "kind": "reddit"
    }
  ],
  "recommendations": [
    {
      "rank": 1,
      "note": "The open-printer default. Listed nozzle and bed temperatures sit in the range most open machines publish.",
      "brand": "Polymaker",
      "product": "Polylite PLA",
      "material": "PLA",
      "url": "/brand/polymaker/polylite-pla",
      "nozzle": "190–230 °C",
      "bed": "25–60 °C",
      "pricePerKg": null,
      "datasheetUrl": "https://cdn.shopify.com/s/files/1/0548/7299/7945/files/PolyLite_PLA_TDS_EN_V5.4.pdf",
      "affiliateUrl": null
    },
    {
      "rank": 2,
      "note": "Same role, Prusa’s own PLA, with a listed range. Best when the part is a model rather than a hot functional piece.",
      "brand": "Prusament",
      "product": "PLA",
      "material": "PLA",
      "url": "/brand/prusament/pla",
      "nozzle": "205–225 °C",
      "bed": "40–60 °C",
      "pricePerKg": null,
      "datasheetUrl": null,
      "affiliateUrl": null
    },
    {
      "rank": 3,
      "note": "The open-printer functional filament. It still wants a heated bed; check the printer’s maximum bed temperature against this row.",
      "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": 4,
      "note": "A second PETG with listed temperatures, if that spool is what is on hand.",
      "brand": "Polymaker",
      "product": "Polylite PETG",
      "material": "PETG",
      "url": "/brand/polymaker/polylite-petg",
      "nozzle": "220–250 °C",
      "bed": "70–90 °C",
      "pricePerKg": null,
      "datasheetUrl": "https://cdn.shopify.com/s/files/1/0548/7299/7945/files/PolyLite_PETG_TDS_EN_V5.4.pdf",
      "affiliateUrl": null
    }
  ]
}