{
  "opening": "Use PLA for an indoor sign, with a profile for that color. These threads do not crown a filament for outdoor lettering: a wood-PLA birdhouse post says that print lasted 3 years outside, and the outdoor guide still ranks ASA ahead of PLA for sun.",
  "question": "What filament is best for signs and lettering?",
  "slug": "signs",
  "useCase": "outdoor",
  "useCaseLabel": "Outdoor",
  "updated": "2026-10-20",
  "shortAnswer": "Use PLA for an indoor sign, with a profile for that color. These threads do not crown a filament for outdoor lettering: a wood-PLA birdhouse post says that print lasted 3 years outside, and the outdoor guide still ranks ASA ahead of PLA for sun.",
  "recommendedMaterials": [
    "pla",
    "asa",
    "petg"
  ],
  "printerConsiderations": [
    "A two-color sign that swaps at a layer does not need an MMU. That use is a score-37 reply on r/prusa3d 139j5ic, cited from the MMU page.",
    "Outdoor letters still follow the outdoor guide. Dark colors in the sun are called out there as a heat problem, with no temperature rise attached.",
    "The birdhouse post states 3 walls and 30% gyroid. Those are the poster's settings for that wood-PLA print, not a lettering profile."
  ],
  "pros": [
    "Indoor PLA is tied to catalog rows with a nozzle and a bed.",
    "The outdoor ASA row is labeled as the outdoor guide's material, separate from the birdhouse anecdote."
  ],
  "cons": [
    "Four of the five threads are not about choosing a sign filament. One is a filament-sensor tube, one is a mirror-adapter request, one is a plate reminder, and one is a melted-filament string.",
    "The 3-year wood-PLA birdhouse is the poster's report. It is not a weathering test, and wood PLA is not one of the ranked ids."
  ],
  "community": "r/3Dprinting 1w14zsq shows a wood-PLA birdhouse the poster says has lasted 3 years outside, printed with 3 walls and 30% gyroid, and asks whether the wood pulp adds UV resistance. A score-118 reply says their PLA rarely fails in the sun, names a dashboard boomerang and a greenhouse seed starter as the two that deformed, and says PLA+ on a motorcycle in Florida has lasted over a year. The same reply says to try PETG if you want it to last. A score-46 reply says PLA does not dissolve after 30 minutes in the sun. r/prusa3d 1q8oppv is a CORE One+ filament sensor whose PTFE tube is pinched. r/3Dprinting 17m6bmr asks for an ABS mirror adapter and the replies are design notes, not a filament comparison. r/BambuLab 1lsyhjh is a printed reminder of which build-plate side is for PLA and which is for PETG. The top replies say to clean the plate. r/FixMyPrint 1141uh6 asks if a cheese-like string means the printer is too hot. The score-63 reply says melted plastic looks like melted plastic. Later replies flag an Anet A8 power supply.",
  "related": [
    "outdoor",
    "pla_outdoor",
    "multicolor"
  ],
  "faq": [
    {
      "q": "Did these threads pick ASA for outdoor signs?",
      "a": "They did not. The birdhouse thread is a wood-PLA anecdote, and one reply tells the poster to try PETG for a longer life. ASA is the material on the outdoor guide, with its own listed nozzle and bed."
    },
    {
      "q": "How do I print two-color letters without an MMU?",
      "a": "Swap filament at a layer. A score-37 reply on the two-spool Prusa thread names signs as that use. The multicolor guide covers printing more than one filament in one job."
    }
  ],
  "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": "Bambu ASA technical data sheet",
      "url": "https://cdn.shopify.com/s/files/1/0645/5876/0155/files/Bambu_ASA_Technical_Data_Sheet.pdf",
      "kind": "datasheet"
    },
    {
      "title": "PolyLite PLA product page",
      "url": "https://us.polymaker.com/products/polylite-pla",
      "kind": "manufacturer"
    },
    {
      "title": "SUNLU filament wiki",
      "url": "https://www.sunlu.com/wiki/61",
      "kind": "manufacturer"
    },
    {
      "title": "Community source, r/3Dprinting 1w14zsq",
      "url": "https://www.reddit.com/r/3Dprinting/comments/1w14zsq/",
      "kind": "reddit"
    },
    {
      "title": "Community source, r/prusa3d 1q8oppv",
      "url": "https://www.reddit.com/r/prusa3d/comments/1q8oppv/",
      "kind": "reddit"
    },
    {
      "title": "Community source, r/3Dprinting 17m6bmr",
      "url": "https://www.reddit.com/r/3Dprinting/comments/17m6bmr/",
      "kind": "reddit"
    },
    {
      "title": "Community source, r/BambuLab 1lsyhjh",
      "url": "https://www.reddit.com/r/BambuLab/comments/1lsyhjh/",
      "kind": "reddit"
    },
    {
      "title": "Community source, r/FixMyPrint 1141uh6",
      "url": "https://www.reddit.com/r/FixMyPrint/comments/1141uh6/",
      "kind": "reddit"
    }
  ],
  "recommendations": [
    {
      "rank": 1,
      "note": "PLA Basic technical data sheet. Nozzle 190–230 °C (374–446 °F), bed 35–45 °C (95–113 °F), drying at 50 °C (122 °F) for 8 h. A fit for indoor letters on the A1, A1 mini, P1S, and X1 Carbon hotends stored at 300 °C (572 °F).",
      "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": "PolyLite PLA lists 190–230 °C (374–446 °F), a bed of 25–60 °C (77–140 °F), 40–60 mm/s, and drying at 55 °C (131 °F) for 6 h. The product page lists the fan on. Indoor lettering can use this row. It is not a UV rating.",
      "brand": "Polymaker",
      "product": "Polylite PLA",
      "material": "PLA",
      "url": "/brand/polymaker/polylite-pla",
      "nozzle": "190–230 °C (374–446 °F)",
      "bed": "25–60 °C (77–140 °F)",
      "pricePerKg": null,
      "datasheetUrl": "https://cdn.shopify.com/s/files/1/0548/7299/7945/files/PolyLite_PLA_TDS_EN_V5.4.pdf",
      "affiliateUrl": null
    },
    {
      "rank": 3,
      "note": "SUNLU PLA lists 190–230 °C (374–446 °F) and a bed of 50–70 °C (122–158 °F). Drying on the row is 50–55 °C (122–131 °F) for 8 h from the SUNLU wiki. The plate-reminder sign thread is a printed label, and the top replies say to wash the plate.",
      "brand": "SUNLU",
      "product": "PLA",
      "material": "PLA",
      "url": "/brand/sunlu/pla",
      "nozzle": "190–230 °C (374–446 °F)",
      "bed": "50–70 °C (122–158 °F)",
      "pricePerKg": null,
      "datasheetUrl": null,
      "affiliateUrl": null
    },
    {
      "rank": 4,
      "note": "Bambu ASA technical data sheet. Nozzle 235–260 °C (455–500 °F), bed 90–110 °C (194–230 °F), drying at 80 °C (176 °F) for 8 h. This is the outdoor-guide material, not a filament named by the sign threads. The bed top is above the A1 maximum of 100 °C (212 °F) and above the A1 mini maximum of 80 °C (176 °F).",
      "brand": "Bambu Lab",
      "product": "ASA",
      "material": "ASA",
      "url": "/brand/bambu-lab/asa",
      "nozzle": "235–260 °C (455–500 °F)",
      "bed": "90–110 °C (194–230 °F)",
      "pricePerKg": null,
      "datasheetUrl": "https://cdn.shopify.com/s/files/1/0645/5876/0155/files/Bambu_ASA_Technical_Data_Sheet.pdf",
      "affiliateUrl": null
    }
  ]
}