{
  "opening": "PLA and PETG can stay in the MMU3 loop for a single-filament print. The practical TPU reply on the MMU3 thread is to bypass the MMU and print as a plain MK4.",
  "question": "What filaments work in the Prusa MMU?",
  "slug": "mmu",
  "useCase": "prusa",
  "useCaseLabel": "Prusa",
  "updated": "2026-10-20",
  "shortAnswer": "PLA and PETG can stay in the MMU3 loop for a single-filament print. The practical TPU reply on the MMU3 thread is to bypass the MMU and print as a plain MK4.",
  "recommendedMaterials": [
    "pla",
    "petg"
  ],
  "printerConsiderations": [
    "The MK4S product page lists a 290 °C (554 °F) nozzle, a 120 °C (248 °F) bed, a Nextruder direct drive, a brass CHT nozzle, and an enclosure that is not included. MMU3 is optional.",
    "Single-filament mode is a score-10 reply on r/prusa3d 1clmrgl. Select the slot in the slicer. A score-2 reply says the scrap piece is the length of the front PTFE tube. That length is the comment, not a Prusa specification.",
    "r/prusa3d 12bjj46 is buffer drag and grinding. The poster says they use 3 mm ID bowden and a straight section before the MMU. That is the poster's tubing, not a filament."
  ],
  "pros": [
    "PLA and PETG are ranked because the MK4S can hold their listed temperatures and the single-filament replies keep the MMU in the path.",
    "TPU is described the way the MMU3 thread describes it: bypass the unit."
  ],
  "cons": [
    "r/FixMyPrint uitndx is dark-to-light purge on an MMU2S. The top comments are South Park jokes, so this page takes no purge volume from them.",
    "A score-9 reply has babysat Ninjaflex on an MMU3. Ninjaflex is not a catalog id, and this page does not turn that reply into a TPU-on-MMU setting."
  ],
  "community": "r/FixMyPrint uitndx asks for help going from dark filament to white on an MMU2S on an i3 MK3S+. The post is deleted. The score-96 reply is a Kenny joke, and the next replies continue it. r/prusa3d 139j5ic asks why official photos show two spools on printers that need an MMU for multi-material. The score-90 reply says the holder has room for two spools and that you can swap by hand. A score-37 reply uses the second spool to change filament at a layer for signs. A score-29 reply does the same for two-color prints. r/prusa3d 1f64oe3 asks how people print TPU on the MMU3. The score-10 reply bypasses the MMU3, disables it, removes the bowden, and prints as a plain MK4. A score-9 reply babysits Ninjaflex at the start. A score-3 reply wants TPU supports and finds them hard to remove. r/prusa3d 1clmrgl asks what to do with an MMU3 on mostly single-filament jobs. The score-10 reply leaves it in the path and picks one slot. A score-8 reply uses spool-join. A score-2 reply says the scrap equals the front PTFE tube. r/prusa3d 12bjj46 is a buffer that reintroduced grinding. Replies talk about wheel drag, a straight tube into the MMU, and 3 mm ID bowden.",
  "related": [
    "multicolor",
    "mk4_filament",
    "ams"
  ],
  "faq": [
    {
      "q": "Should TPU run through the MMU3?",
      "a": "The score-10 reply on r/prusa3d 1f64oe3 says no for a single-material TPU print. Disable the MMU, remove the bowden, and print as a plain MK4. The same reply has no advice for a multi-material TPU job."
    },
    {
      "q": "What purge volume does the MMU2S thread recommend?",
      "a": "None. The post is deleted, and the highest-scored comments are jokes about Kenny. This page does not publish a purge volume or a tip-forming temperature."
    }
  ],
  "sources": [
    {
      "title": "Prusament PETG technical data sheet",
      "url": "https://www.prusa3d.com/file/3464616/prusament-petg-technical-data-sheet.pdf",
      "kind": "datasheet"
    },
    {
      "title": "PolyLite PLA technical data sheet",
      "url": "https://cdn.shopify.com/s/files/1/0548/7299/7945/files/PolyLite_PLA_TDS_EN_V5.4.pdf",
      "kind": "datasheet"
    },
    {
      "title": "Original Prusa MK4S",
      "url": "https://www.prusa3d.com/product/original-prusa-mk4s-3d-printer-5/",
      "kind": "manufacturer"
    },
    {
      "title": "SUNLU filament wiki",
      "url": "https://www.sunlu.com/wiki/61",
      "kind": "manufacturer"
    },
    {
      "title": "Community source, r/FixMyPrint uitndx",
      "url": "https://www.reddit.com/r/FixMyPrint/comments/uitndx/",
      "kind": "reddit"
    },
    {
      "title": "Community source, r/prusa3d 139j5ic",
      "url": "https://www.reddit.com/r/prusa3d/comments/139j5ic/",
      "kind": "reddit"
    },
    {
      "title": "Community source, r/prusa3d 1f64oe3",
      "url": "https://www.reddit.com/r/prusa3d/comments/1f64oe3/",
      "kind": "reddit"
    },
    {
      "title": "Community source, r/prusa3d 1clmrgl",
      "url": "https://www.reddit.com/r/prusa3d/comments/1clmrgl/",
      "kind": "reddit"
    },
    {
      "title": "Community source, r/prusa3d 12bjj46",
      "url": "https://www.reddit.com/r/prusa3d/comments/12bjj46/",
      "kind": "reddit"
    }
  ],
  "recommendations": [
    {
      "rank": 1,
      "note": "Prusament PLA lists a nozzle of 205–225 °C (401–437 °F) and a bed of 40–60 °C (104–140 °F). Both sit under the MK4S maxima of 290 °C (554 °F) and 120 °C (248 °F). The MK4S record lists MMU3 as optional and a brass CHT nozzle.",
      "brand": "Prusament",
      "product": "PLA",
      "material": "PLA",
      "url": "/brand/prusament/pla",
      "nozzle": "205–225 °C (401–437 °F)",
      "bed": "40–60 °C (104–140 °F)",
      "pricePerKg": null,
      "datasheetUrl": null,
      "affiliateUrl": null
    },
    {
      "rank": 2,
      "note": "Prusament PETG technical data sheet lists 240–260 °C (464–500 °F) and a bed of 70–90 °C (158–194 °F). Drying on the row is the Prusa material guide, 55 °C (131 °F) for 6 h. The MMU threads do not publish a PETG tip temperature.",
      "brand": "Prusament",
      "product": "PETG",
      "material": "PETG",
      "url": "/brand/prusament/petg",
      "nozzle": "240–260 °C (464–500 °F)",
      "bed": "70–90 °C (158–194 °F)",
      "pricePerKg": null,
      "datasheetUrl": "https://www.prusa3d.com/file/3464616/prusament-petg-technical-data-sheet.pdf",
      "affiliateUrl": null
    },
    {
      "rank": 3,
      "note": "PolyLite PLA lists 190–230 °C (374–446 °F), a bed of 25–60 °C (77–140 °F), and drying at 55 °C (131 °F) for 6 h. It fits the MK4S nozzle and bed. It is a catalog PLA with a datasheet, not a spool named in the MMU threads.",
      "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": 4,
      "note": "SUNLU PLA lists 190–230 °C (374–446 °F) and a bed of 50–70 °C (122–158 °F), with drying at 50–55 °C (122–131 °F) for 8 h from the SUNLU wiki. Same fit on the MK4S. The threads do not name SUNLU.",
      "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
    }
  ]
}