{
  "opening": "Bambu PLA Silk+ lists a Z-direction tensile strength of 25 ± 4 MPa, which is the stress on a test bar pulled apart between layers. Bambu PLA Basic lists 31 ± 3 MPa on that same measurement. Z elongation is 1.5 ± 0.2 percent on Silk+ and 7.5 ± 1.3 percent on Basic. That pair is the strength gap this catalog can document. The sheets do not explain a clog, and the gap is not assigned to every silk spool.",
  "question": "Is silk PLA weaker, and why does it clog?",
  "slug": "silk_strength",
  "useCase": "pla",
  "useCaseLabel": "PLA",
  "updated": "2026-10-27",
  "shortAnswer": "Bambu PLA Silk+ lists a Z-direction tensile strength of 25 ± 4 MPa, which is the stress on a test bar pulled apart between layers. Bambu PLA Basic lists 31 ± 3 MPa on that same measurement. Z elongation is 1.5 ± 0.2 percent on Silk+ and 7.5 ± 1.3 percent on Basic. That pair is the strength gap this catalog can document. The sheets do not explain a clog, and the gap is not assigned to every silk spool.",
  "recommendedMaterials": [
    "pla"
  ],
  "printerConsiderations": [
    "A megapascal is the stress on the test bar. Z is the direction that pulls layers apart. A lower Z number is the weaker layer bond on that sheet, for that pair of filaments only.",
    "Silk+ also lists a lower speed cap, under 250 mm/s against under 300 mm/s on PLA Basic, and a nozzle that starts at 210 °C (410 °F) instead of 190 °C (374 °F). [Silk PLA](/answers/silk) is the longer page. [Two-color silk](/answers/dual_color_silk) is the color variant. [Clogs](/answers/clog) and [layer adhesion](/answers/layer_adh) are the failure pages.",
    "Polymaker Silk PLA stores 190–230 °C (374–446 °F). A comment that silk should run about 10 degrees hotter is a comment. It is not this row's nozzle."
  ],
  "pros": [
    "The strength comparison is two tables from one company, with the test direction named.",
    "Polymaker silk stays on its own temperature band, without borrowed megapascals."
  ],
  "cons": [
    "Silk+'s introduction talks about strength and toughness. The specimen table is lower than PLA Basic. The marketing line and the table disagree.",
    "Two comments disagree on layer adhesion. One calls it really bad. One calls the difference small and blames a cold nozzle. Neither comment is a datasheet."
  ],
  "community": "One comment says silk PLA generally has to be printed about 10 degrees hotter than normal PLA. Another says silk layer adhesion is really bad and varies by brand and color. A third says the difference is small and that breaks between layers usually mean the print was too cold.",
  "related": [
    "silk",
    "dual_color_silk",
    "clog",
    "layer_adh"
  ],
  "faq": [
    {
      "q": "Is silk PLA weaker, and why does it clog?",
      "a": "Bambu PLA Silk+ lists a Z-direction tensile strength of 25 ± 4 MPa, which is the stress on a test bar pulled apart between layers. Bambu PLA Basic lists 31 ± 3 MPa on that same measurement. Z elongation is 1.5 ± 0.2 percent on Silk+ and 7.5 ± 1.3 percent on Basic. That pair is the strength gap this catalog can document. The sheets do not explain a clog, and the gap is not assigned to every silk spool."
    },
    {
      "q": "Are all silk PLAs weaker than plain PLA?",
      "a": "Only the Bambu pair is documented here. Silk+ Z tensile strength is 25 ± 4 MPa against 31 ± 3 MPa for PLA Basic, and Z elongation is 1.5 ± 0.2 percent against 7.5 ± 1.3 percent. Polymaker Silk PLA has no such table in the catalog. [Silk](/answers/silk), [dual-color silk](/answers/dual_color_silk), [clogs](/answers/clog), and [layer adhesion](/answers/layer_adh) are the related pages."
    },
    {
      "q": "Why does silk clog?",
      "a": "The Silk+ and PLA Basic sheets do not give a clog cause. They do show a slower speed cap on Silk+ and a nozzle band that starts 20 degrees higher at the bottom. A comment says to go about 10 degrees hotter. Another says interlayer breaks mean the nozzle was too cold. Those are comments, and they do not match each other exactly."
    }
  ],
  "sources": [
    {
      "title": "Bambu PLA Silk+ technical data sheet V1.0",
      "url": "https://cdn.shopify.com/s/files/1/0584/7236/6216/files/Bambu_PLA_Silk__Technical_Data_Sheet.pdf",
      "kind": "datasheet"
    },
    {
      "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",
      "kind": "datasheet"
    },
    {
      "title": "Community source, r/FixMyPrint 122k25z",
      "url": "https://www.reddit.com/r/FixMyPrint/comments/122k25z/",
      "kind": "reddit"
    },
    {
      "title": "Community source, r/3Dprinting t12hoo",
      "url": "https://www.reddit.com/r/3Dprinting/comments/t12hoo/",
      "kind": "reddit"
    },
    {
      "title": "Community source, r/ender3 115pa90",
      "url": "https://www.reddit.com/r/ender3/comments/115pa90/",
      "kind": "reddit"
    },
    {
      "title": "Community source, r/FixMyPrint vpzzcj",
      "url": "https://www.reddit.com/r/FixMyPrint/comments/vpzzcj/",
      "kind": "reddit"
    },
    {
      "title": "Community source, r/FixMyPrint 11v9tr5",
      "url": "https://www.reddit.com/r/FixMyPrint/comments/11v9tr5/",
      "kind": "reddit"
    }
  ],
  "recommendations": [
    {
      "rank": 1,
      "note": "Catalog nozzle and bed are empty. Technical data sheet V1.0 lists a nozzle of 210–240 °C (410–464 °F), a bed of 35–45 °C (95–113 °F), drying at 55 °C (131 °F) for 8 h, and a print speed under 250 mm/s. Z tensile strength is 25 ± 4 MPa. Z elongation is 1.5 ± 0.2 percent. X-Y elongation is 2.8 ± 0.6 percent.",
      "brand": "Bambu Lab",
      "product": "PLA Silk+",
      "material": "PLA",
      "url": "/brand/bambu-lab/pla-silk-plus",
      "nozzle": "210–240 °C (410–464 °F)",
      "bed": "35–45 °C (95–113 °F)",
      "pricePerKg": null,
      "datasheetUrl": "https://cdn.shopify.com/s/files/1/0584/7236/6216/files/Bambu_PLA_Silk__Technical_Data_Sheet.pdf?v=1733472353",
      "affiliateUrl": null
    },
    {
      "rank": 2,
      "note": "Technical data sheet nozzle 190–230 °C (374–446 °F) and bed 35–45 °C (95–113 °F), with a print speed under 300 mm/s. Z tensile strength is 31 ± 3 MPa. Z elongation is 7.5 ± 1.3 percent. X-Y elongation is 12.2 ± 1.8 percent. Bambu says the specimen numbers are for comparison, not a guarantee on a finished part.",
      "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": 3,
      "note": "Catalog nozzle 190–230 °C (374–446 °F) and bed 50–70 °C (122–158 °F), Open Filament Database. No tensile strength is stored, so the Silk+ megapascals are not copied onto this row. The 210–240 °C (410–464 °F) band belongs to Silk+ only.",
      "brand": "Polymaker",
      "product": "Silk PLA",
      "material": "PLA",
      "url": "/brand/polymaker/silk-pla",
      "nozzle": "190–230 °C (374–446 °F)",
      "bed": "50–70 °C (122–158 °F)",
      "pricePerKg": null,
      "datasheetUrl": null,
      "affiliateUrl": null
    }
  ]
}