{
  "opening": "These PLA rows list 190–230 °C (374–446 °F).",
  "question": "What causes under-extrusion with certain filaments?",
  "slug": "underext",
  "useCase": "troubleshooting",
  "useCaseLabel": "Troubleshooting",
  "updated": "2026-10-17",
  "shortAnswer": "A spool that under-extrudes while another brand does not is, in these threads, the wrong temperature and flow for that brand, a gear that is not gripping, a partial clog, or PLA softened inside a closed enclosure. One thread that looked sparse was a bridge printed with no supports.",
  "recommendedMaterials": [
    "pla"
  ],
  "printerConsiderations": [
    "On r/FixMyPrint 12c7d7c the leading comment says identical gcode across brands is the miss, and that SUNLU runs slightly hotter than Hatchbox for PLA and PLA+. A later comment says raise the weak spool five or ten degrees, then check the filament diameter with calipers and the flow.",
    "On r/FixMyPrint una950 the title asks about humid filament on a CR-10 using Cura's stock profile. A score-33 comment says the extruder gear is off center or wobbling, so only one side grips.",
    "On r/3Dprinting 105by21 closing a Creality enclosure at 200 °C (392 °F) nozzle and 50 °C (122 °F) bed, the title's units, made PLA under-extrude. Comments call it heat creep: the extruder teeth mash soft PLA, and the enclosure is described as the tool for ABS or PETG."
  ],
  "pros": [
    "The SUNLU and Hatchbox rows show the same catalog window, so the comment's slightly higher temperature is not disguised as a database edit.",
    "The bridge thread is separated from real under-extrusion. The post says the part was printed without supports."
  ],
  "cons": [
    "The large under-extrusion thread, r/3Dprinting skq3dn, did not yield the original poster's fix in the comments this page retrieved. The retrieved comments talk about a slow host parsing gcode.",
    "Five or ten degrees is the comment on 12c7d7c. It is not a new SUNLU nozzle range."
  ],
  "community": "r/FixMyPrint 12c7d7c is SUNLU under-extruded beside Hatchbox. The score-79 comment says each filament wants its own temperature and speed. A score-17 comment keeps a profile per brand. A score-8 comment says try five or ten degrees hotter, then measure diameter and raise flow if the filament is thin. r/FixMyPrint 1py4pcc asks if striations and strings are under-extrusion or wet filament. The post is Bambu Basic PLA at 220 °C (428 °F) and a textured plate at 55 °C (131 °F), ironed, printed without supports. A score-19 comment says the bottom looks normal for bridges with no supports, and that ironing needs its own tuning. r/FixMyPrint una950 asks if a repeating sparse pattern is humid filament. A score-33 comment blames an off-center extruder gear. r/3Dprinting 105by21 is PLA under-extruding once an enclosure is zipped, at 200 °C (392 °F) and 50 °C (122 °F). Comments say heat creep. r/3Dprinting skq3dn is a spongy print while the extruder gear still pushes the right length. Retrieved comments mention a Raspberry Pi that cannot feed gcode fast enough.",
  "related": [
    "clog",
    "flow",
    "stringing",
    "drying",
    "brand_sunlu"
  ],
  "faq": [
    {
      "q": "Is 55 °C (131 °F) the Bambu PLA Basic bed?",
      "a": "The post on r/FixMyPrint 1py4pcc used a textured plate at 55 °C (131 °F). Bambu PLA Basic lists a bed of 35–45 °C (95–113 °F) and a nozzle of 190–230 °C (374–446 °F). The stated 220 °C (428 °F) nozzle sits inside the nozzle range. The stated 55 °C (131 °F) bed sits above the bed range."
    },
    {
      "q": "Does a closed enclosure fix under-extrusion?",
      "a": "On r/3Dprinting 105by21 zipping the enclosure created the under-extrusion in PLA at 200 °C (392 °F) nozzle and 50 °C (122 °F) bed. Comments call that heat creep and say the closed box is for ABS or PETG. The clog guide is the next page when the teeth are mashing filament."
    }
  ],
  "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": "SUNLU brand site",
      "url": "https://sunlu.com/",
      "kind": "manufacturer"
    },
    {
      "title": "Hatchbox brand site",
      "url": "https://hatchbox3d.com",
      "kind": "manufacturer"
    },
    {
      "title": "Open Filament Database, SUNLU PLA",
      "url": "https://api.openfilamentdatabase.org/api/v1/brands/sunlu/materials/PLA/filaments/pla/index.json",
      "kind": "other"
    },
    {
      "title": "Open Filament Database, Hatchbox PLA",
      "url": "https://api.openfilamentdatabase.org/api/v1/brands/hatchbox/materials/PLA/filaments/pla/index.json",
      "kind": "other"
    },
    {
      "title": "Community source, r/3Dprinting skq3dn",
      "url": "https://www.reddit.com/r/3Dprinting/comments/skq3dn/",
      "kind": "reddit"
    },
    {
      "title": "Community source, r/FixMyPrint 1py4pcc",
      "url": "https://www.reddit.com/r/FixMyPrint/comments/1py4pcc/",
      "kind": "reddit"
    },
    {
      "title": "Community source, r/FixMyPrint 12c7d7c",
      "url": "https://www.reddit.com/r/FixMyPrint/comments/12c7d7c/",
      "kind": "reddit"
    },
    {
      "title": "Community source, r/FixMyPrint una950",
      "url": "https://www.reddit.com/r/FixMyPrint/comments/una950/",
      "kind": "reddit"
    },
    {
      "title": "Community source, r/3Dprinting 105by21",
      "url": "https://www.reddit.com/r/3Dprinting/comments/105by21/",
      "kind": "reddit"
    }
  ],
  "recommendations": [
    {
      "rank": 1,
      "note": "SUNLU PLA lists a nozzle of 190–230 °C (374–446 °F) and a bed of 50–70 °C (122–158 °F). On r/FixMyPrint 12c7d7c it under-extruded on gcode that suited Hatchbox. Both PLA rows list the same nozzle range.",
      "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": 2,
      "note": "Hatchbox PLA lists a nozzle of 190–230 °C (374–446 °F) and a bed of 50–70 °C (122–158 °F), the same window as SUNLU PLA. The comment that SUNLU wants a slightly higher temperature is not a different stored range.",
      "brand": "Hatchbox",
      "product": "PLA",
      "material": "PLA",
      "url": "/brand/hatchbox/pla",
      "nozzle": "190–230 °C (374–446 °F)",
      "bed": "50–70 °C (122–158 °F)",
      "pricePerKg": null,
      "datasheetUrl": null,
      "affiliateUrl": null
    },
    {
      "rank": 3,
      "note": "Bambu PLA Basic lists a nozzle of 190–230 °C (374–446 °F) and a bed of 35–45 °C (95–113 °F) on the technical data sheet. The bridge post states 220 °C (428 °F), inside the nozzle, and a textured plate at 55 °C (131 °F), above this bed.",
      "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
    }
  ]
}