{
  "opening": "The supplied comments do not name a filament. They joke about a wet-shoe photo. A printed shoe or insole is skin contact, and none of the TPU rows below stores a skin-contact certification. The stiffness and the print settings are the only numbers those rows publish.",
  "question": "What filament should I use for shoes or insoles?",
  "slug": "shoes",
  "useCase": "flexible",
  "useCaseLabel": "Flexible",
  "updated": "2026-10-25",
  "shortAnswer": "The supplied comments do not name a filament. They joke about a wet-shoe photo. A printed shoe or insole is skin contact, and none of the TPU rows below stores a skin-contact certification. The stiffness and the print settings are the only numbers those rows publish.",
  "recommendedMaterials": [
    "tpu"
  ],
  "printerConsiderations": [
    "Shore 85A and Shore 64D are not the same stiffness. 64D is the harder number. Do not treat the letter change as a rounding error.",
    "A score-23 comment asks the poster to share a fix for wet children's boots. It does not name TPU, PLA, or a shore value.",
    "Skin contact, sweat, and a part worn for hours are [medical and skin-contact use](/answers/medical). No safety certification is listed."
  ],
  "pros": [
    "The page refuses to promote a hobby TPU to a skin-safe insole.",
    "The one row that cites an ISO 10993 line is quoted with the limit already on the medical page: no contact duration."
  ],
  "cons": [
    "No supplied comments recommends a filament, a shore value, or a print temperature."
  ],
  "community": "The editorial summary says TPU for shoe parts and insoles. The excerpts do not say TPU. r/3Dprinting 1cp8v94, score 3, says you could pitch this to JSchlatt. Score 2 says you should invent one for hair and it would sell millions. r/functionalprint 1cpc7w7, score 23, asks whether the poster will share a fix for wet children's boots. Score 8 jokes about smelling the picture. No excerpt was supplied for r/FixMyPrint 1jyzpt1, r/BambuLab 1mgtaww, or r/BambuLab 1msc0cb.",
  "related": [
    "flex",
    "tpu_hardness",
    "medical"
  ],
  "faq": [
    {
      "q": "What filament should I use for shoes or insoles?",
      "a": "The supplied comments do not name a filament. They joke about a wet-shoe photo. A printed shoe or insole is skin contact, and none of the TPU rows below stores a skin-contact certification. The stiffness and the print settings are the only numbers those rows publish."
    },
    {
      "q": "Is TPU safe against skin?",
      "a": "Not from these four rows as a group. Bambu TPU 95A HF, Bambu TPU 85A, and NinjaFlex store no certification. Siraya Tech Flex TPU 64D's sheet, read 23 October 2026, says ISO 10993-5, 10, and 23 were tested for biocompatibility support and does not state a contact time. [Medical and skin-contact parts](/answers/medical) is the page that keeps that limit."
    },
    {
      "q": "Which shore hardness is a shoe?",
      "a": "The comments do not say. The catalog stores Shore 85A on Bambu TPU 85A, with a nozzle of 200–250 °C (392–482 °F) and a bed of 30–35 °C (86–95 °F). Siraya's sheet stores Shore 64D. [Shore hardness](/answers/tpu_hardness) explains the scale. [How to print TPU](/answers/flex) is the printer setup. Neither page is a footwear standard."
    }
  ],
  "sources": [
    {
      "title": "Bambu TPU 95A HF technical data sheet",
      "url": "https://cdn.shopify.com/s/files/1/0584/7236/6216/files/Bambu_TPU_95A_HF_Technical_Data_Sheet.pdf?v=1700101819",
      "kind": "datasheet"
    },
    {
      "title": "Open Filament Database, NinjaTek NinjaFlex",
      "url": "https://api.openfilamentdatabase.org/api/v1/brands/ninjatek/materials/TPU/filaments/ninjaflex_tpu/index.json",
      "kind": "other"
    },
    {
      "title": "Siraya Tech Flex TPU 64D TDS",
      "url": "https://siraya.tech/pages/flex-tpu-64d-filament-tds",
      "kind": "manufacturer"
    },
    {
      "title": "Community source, r/3Dprinting 1cp8v94",
      "url": "https://www.reddit.com/r/3Dprinting/comments/1cp8v94/",
      "kind": "reddit"
    },
    {
      "title": "Community source, r/functionalprint 1cpc7w7",
      "url": "https://www.reddit.com/r/functionalprint/comments/1cpc7w7/",
      "kind": "reddit"
    },
    {
      "title": "Community source, r/FixMyPrint 1jyzpt1",
      "url": "https://www.reddit.com/r/FixMyPrint/comments/1jyzpt1/",
      "kind": "reddit"
    },
    {
      "title": "Community source, r/BambuLab 1mgtaww",
      "url": "https://www.reddit.com/r/BambuLab/comments/1mgtaww/",
      "kind": "reddit"
    },
    {
      "title": "Community source, r/BambuLab 1msc0cb",
      "url": "https://www.reddit.com/r/BambuLab/comments/1msc0cb/",
      "kind": "reddit"
    }
  ],
  "recommendations": [
    {
      "rank": 1,
      "note": "Technical data sheet checked 18 October 2026 lists a nozzle of 220–240 °C (428–464 °F), a bed of 30–35 °C (86–95 °F), drying at 70 °C (158 °F) for 8 h, and speed up to 200 mm/s. Shore hardness is not stored on this row. No safety certification is listed.",
      "brand": "Bambu Lab",
      "product": "TPU 95A HF",
      "material": "TPU",
      "url": "/brand/bambu-lab/tpu-95a-hf",
      "nozzle": "220–240 °C (428–464 °F)",
      "bed": "30–35 °C (86–95 °F)",
      "pricePerKg": null,
      "datasheetUrl": "https://cdn.shopify.com/s/files/1/0584/7236/6216/files/Bambu_TPU_95A_HF_Technical_Data_Sheet.pdf?v=1700101819",
      "affiliateUrl": null
    },
    {
      "rank": 2,
      "note": "Nozzle 200–250 °C (392–482 °F), bed 30–35 °C (86–95 °F), drying at 70 °C (158 °F) for 8 h, speed up to 200 mm/s, and Shore 85A stored on the row. No safety certification is listed. 85A is a stiffness figure, not a skin-contact clearance.",
      "brand": "Bambu Lab",
      "product": "TPU 85A",
      "material": "TPU",
      "url": "/brand/bambu-lab/tpu-85a",
      "nozzle": "200–250 °C (392–482 °F)",
      "bed": "30–35 °C (86–95 °F)",
      "pricePerKg": null,
      "datasheetUrl": "https://cdn.shopify.com/s/files/1/0645/5876/0155/files/Bambu_TPU_85A_Technical_Data_Sheet_a7233668-497b-487f-af8a-3adb49fafaa1.pdf?v=1741314674",
      "affiliateUrl": null
    },
    {
      "rank": 3,
      "note": "Open Filament Database, dataset imported 13 October 2026, lists a nozzle of 210–240 °C (410–464 °F) and a bed of 30–60 °C (86–140 °F). Shore hardness, drying, and certifications are empty. The title is not a biocompatibility test.",
      "brand": "NinjaTek",
      "product": "NinjaFlex TPU",
      "material": "TPU",
      "url": "/brand/ninjatek/ninjaflex-tpu",
      "nozzle": "210–240 °C (410–464 °F)",
      "bed": "30–60 °C (86–140 °F)",
      "pricePerKg": null,
      "datasheetUrl": null,
      "affiliateUrl": null
    },
    {
      "rank": 4,
      "note": "Product TDS page read 23 October 2026 lists a nozzle of 240–270 °C (464–518 °F), a bed of 45 °C (113 °F), and Shore 64D by ISO 7619. It states ISO 10993-5, 10, and 23 tested for biocompatibility support, and it states no contact duration. That is the medical page's row. It is not a shoe approval.",
      "brand": "Siraya Tech",
      "product": "Flex TPU 64D",
      "material": "TPU",
      "url": "/brand/siraya-tech/flex-tpu-64d",
      "nozzle": "240–270 °C (464–518 °F)",
      "bed": "45 °C (113 °F)",
      "pricePerKg": null,
      "datasheetUrl": "https://siraya.tech/pages/flex-tpu-64d-filament-tds",
      "affiliateUrl": null
    }
  ]
}