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Flexible materials · Material guide

Carbon-fibre TPU

Carbon-filled hard TPU at 70 Shore D for damping mounts and semi-rigid brackets. Extrudr flags it as the one FLEX grade that needs a hardened nozzle, and sells it direct in 0.5 and 2 kg…

1 product listing1 brand
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Understand the material

At a glance

Before you print

Setup difficulty
Advanced — enclosure, hardware upgrades, tuning; hardened nozzle needed
Nozzle wear
Highly abrasive — standard CF composite
Read conditions and sources ↓
Read the full material overview

Carbon-filled hard TPU at 70 Shore D for damping mounts and semi-rigid brackets. Extrudr flags it as the one FLEX grade that needs a hardened nozzle, and sells it direct in 0.5 and 2 kg coils; no reseller or second brand was found.

Applications

Carbon-filled TPU occupies a different role from carbon-filled rigid plastics: it is a firm elastomer for wheels, compliant mounts and parts that need to deform while retaining more shape than soft TPU. Extrudr FLEX Hard CF is rated on the Shore D scale and remains capable of substantial elongation. Extrudr has demonstrated printed longboard wheels with this specific formulation, showing that the material is used as a working elastomer rather than merely for a carbon-like appearance.

The filler does not make it a rigid structural nylon, nor does it automatically improve every elastomer property. Extrudr publishes the same abrasion loss for FLEX Hard CF and the unfilled FLEX Hard, while the filled version has lower elongation. Creep and dynamic behavior still depend on geometry, load and temperature; a hardness number cannot establish vibration isolation or wheel lifetime.

  • Printed longboard wheels ↗

    FDM · Extrudr FLEX Hard Carbon / FLEX Hard CF, hard carbon-filled TPU · Documented case

    Extrudr reports designing and printing longboard wheels in FLEX Hard Carbon and having them tried by a professional longboarder. This is a manufacturer demonstration for that filament, not a general wheel rating for carbon-filled TPU.

Sources
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Representative catalog values. Check the exact grade and its linked conditions before using a setting.

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Properties & source data

48 documented fields

Open a topic to explore the complete data. Each value keeps its original conditions, units and dated sources.

Material & market7 fields
Carbon-fibre TPU — Identity & Market
Property and unitPublished value and conditionsSources and dates
Base polymer / chemistryCarbon-fibre reinforced thermoplastic polyurethane at the hard end of the range
1 source
Density (g/cm³)1.22 (Extrudr FLEX HARD CF, ISO 2781)
1 source
Typical price (USD/kg)107 for the only retail listing found (Extrudr 0.5 kg coil, incl. VAT)
1 source
Price range across brands (USD/kg)One listing only: EUR 49.56 incl. VAT per 0.5 kg coil, direct from Extrudr; no reseller or second brand found
1 source
Market availability (1–5)Niche, a handful of specialist brands — Extrudr's FLEX HARD CF is the only carbon-filled flexible with a published datasheet found here
1 source
Spool sizes & diameters1.75 mm; 0.5 and 2 kg coils
1 source
Typical applicationsStiffened flexible parts — damping mounts and semi-rigid brackets
1 source
Print settings6 fields
Carbon-fibre TPU — Printing Parameters
Property and unitPublished value and conditionsSources and dates
Nozzle temperature (°C)230–260 (Extrudr FLEX HARD CF)
1 source
Bed temperature (°C)50–90 (Extrudr FLEX HARD CF)
1 source
Enclosure / chamber requirement (1–5)Open frame is fine
1 source
Bed surface & adhesion aidPEI sheet or painter's tape; Polymaker warns TPU can over-stick and advises a glue stick as a release agent
2 sources
Maximum volumetric flow (mm³/s; see test conditions) (mm³/s)1.6–8 at the 20–100 mm/s Extrudr specifies on a 0.4 mm nozzle at 0.2 mm layer
1 source
Overall printing difficulty (1–5)Advanced — enclosure, hardware upgrades, tuning; hardened nozzle needed
1 source
Nozzle wear & reliability4 fields
Carbon-fibre TPU — Hardware Wear & Reliability
Property and unitPublished value and conditionsSources and dates
Nozzle hardness required (1–4)Hardened steel required — Extrudr marks FLEX HARD CF as needing a hardened nozzle where its unfilled FLEX grades do not
1 source
Abrasiveness (1–5)Highly abrasive — standard CF composite
1 source
Nozzle clog risk (1–5)High — jams from moisture, heat creep or particles; a flexible base plus chopped carbon fibre, which Prusa lists as a higher nozzle-clogging risk, and Extrudr requires a hardened nozzle
3 sources
Hotend requirementNo special hot-end required, but a direct-drive extruder is (Simplify3D)
1 source
Moisture & drying5 fields
Carbon-fibre TPU — Moisture Behaviour
Property and unitPublished value and conditionsSources and dates
Moisture absorption (hygroscopicity) (1–5)Moderate
1 source
Drying temperature & time60 °C for 6 h (Extrudr FLEX HARD CF)
1 source
Symptoms when wetBubbling and popping at the nozzle, stringing and a rough surface
1 source
Effect of moisture on strengthPolymaker groups TPU with the highly hygroscopic materials; no dry-versus-conditioned figures are published
1 source
Storage requirementSealed with desiccant; often kept in a dryer during the print
1 source
Strength & mechanical properties8 fields
Carbon-fibre TPU — Mechanical Properties
Property and unitPublished value and conditionsSources and dates
Young's modulus (MPa)35 (Extrudr FLEX HARD CF, ISO 527-2/5A/500)
1 source
Elongation at break (%)380 ultimate elongation (Extrudr FLEX HARD CF, ISO 527-2/5A/500), against 490 for the unfilled FLEX HARD
1 source
Brittleness (1–5)Very ductile — bends far before failing
1 source
Hardness (scale-specific) (Shore A / Shore D / Rockwell)70 Shore D (Extrudr FLEX HARD CF, ISO 868), against 58 Shore D for the unfilled FLEX HARD
1 source
Creep resistance / sustained load (1–5)Below average — no CF-grade creep test; the grade is 70 Shore D where a 95A TPU bar crept from 74.5 to 82.7 mm over 5 days at 1.25 kg
2 sources
Fatigue / repeated-flex resistance (1–5)Good — 380 % ultimate elongation and a damping application set (Extrudr cites longboard wheels), below the unfilled grades
1 source
Elasticity / flexibility (1–5)Semi-flexible
1 source
Wear resistance & frictionAbrasion 26 mm³ (Extrudr FLEX HARD CF, ISO 4649-A) — the same as the unfilled FLEX HARD
1 source
Heat & temperature2 fields
Carbon-fibre TPU — Thermal Properties
Property and unitPublished value and conditionsSources and dates
Glass transition (Tg) (°C)-24 (Extrudr FLEX HARD CF)
1 source
Melting point / Vicat (°C)Vicat A 140 (Extrudr FLEX HARD CF, ISO 306)
1 source
Weather & chemical resistance5 fields
Carbon-fibre TPU — Environment & Chemical
Property and unitPublished value and conditionsSources and dates
UV resistance (1–5)Good — years with some colour shift; Polymaker lists UV exposure among the conditions TPU withstands
1 source
Chemical resistanceWithstands industrial solvents and UV exposure (Polymaker)
1 source
Food contactNot food safe without specific certification (Polymaker)
1 source
Biodegradability / compostabilityNot biodegradable
1 source
RecyclabilityNot accepted in household plastic collection
1 source
Health & safety3 fields
Carbon-fibre TPU — Health & Safety
Property and unitPublished value and conditionsSources and dates
Fume toxicity (1–5)Low hazard — minimal VOC and particle emission; TPU was not among the nine filaments in the chamber study
1 source
Ventilation / filtration requirement (1–5)Open a window / occasional ventilation
1 source
Dust & fibre handling hazardCarbon fibre is bound in the matrix; sanding dust should not be inhaled
1 source
Finishing & post-processing5 fields
Carbon-fibre TPU — Post-Processing
Property and unitPublished value and conditionsSources and dates
Sanding & machiningDifficult to sand or smooth; Polymaker limits post-processing to trimming or tumbling
1 source
Gluing & solvent weldingCyanoacrylate bonds TPU; no common solvent welds it
1 source
Vapour / chemical smoothingNo practical vapour smoothing
1 source
Support material pairingPolymaker warns TPU supports are often very difficult to remove
1 source
Dimensional accuracy & detailTear strength 165 kN/m (Extrudr FLEX HARD CF, ISO 34-1B)
1 source
Solvents & solubility3 fields
Carbon-fibre TPU — Solvents & Solubility
Property and unitPublished value and conditionsSources and dates
Soluble inDMF, DMSO, NMP and THF dissolve the TPU matrix and leave the fibre; ketones are partial solvents. Laboratory reagents.
1 source
Softened or crazed byToluene and benzene swell it up to +50 % by weight at 23 °C; esters swell it severely; ethanol and IPA soften it.
1 source
Solvent welding & smoothing agentNone practical — the true solvents (DMF, THF, NMP) are laboratory reagents and leave the joint swollen and weak.
1 source
How to read these values

Values describe representative grades, not every spool. Manufacturer datasheets and independent tests retain their source labels and dates. Printed orientation, test method, conditioning and formulation can change results. Unknown values are —. A listed use is not a certification. Shore A, Shore D and Rockwell hardness are separate scales.

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Product listings and datasheets

1 listing

Historical USD/kg snapshots. Read each listing’s sale/from qualifiers, spool mass, source date, shipping and tax notes. Product figures are separate from the material summary.

Browse 1 product from 1 brand
ExtrudrTPU FLEX Hard CF107.05 USD/kg

EUR 49.56 incl. VAT / 0.5 kg coil = EUR 99.12/kg = $107.05/kg at 1.08 USD/EUR, extrudr.com, Aug 2026

Sold direct by Extrudr in 0.5 and 2 kg coils; no reseller listing found.

Open product listing ↗
Extrudr TPU FLEX Hard CF — product-specific figures
Density (g/cm³)1.22 (ISO 2781)
Nozzle temperature (°C)230–260
Bed temperature (°C)50–90
Young's modulus (MPa)35 (ISO 527-2/5A/500)
Elongation at break (%)380 ultimate elongation (ISO 527-2/5A/500)
Hardness (scale-specific) (Shore A / Shore D / Rockwell)70 Shore D (ISO 868)
Wear resistance & frictionAbrasion loss 26 mm³ (ISO 4649-A); tear strength 165 kN/m (ISO 34-1B)
Glass transition (Tg) (°C)-24 (glass transition)
Melting point / Vicat (°C)200–240 melting (ISO 3146-C); Vicat A 140 (ISO 306)
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