3D Printing Info

Filament comparison

PEEK-CF vs PETG-CF

Compare printing settings, strength, heat resistance, dated prices and sources.

Fibre-reinforced PEEK guideCarbon-fibre PETG (PETG-CF) guide

2 selected · all documented properties

Open these two in the interactive comparisonMore PEEK-CF comparisonsMore PETG-CF comparisons
PEEK-CF vs PETG-CF — documented properties and sources
PropertyFibre-reinforced PEEKHIGHTEMPCarbon-fibre PETG (PETG-CF)PETG
Market snapshot
Listing priceUSD/kg; dated snapshots$597.50/kg median; $448.00–$695.00/kg across 5 dated product listings$29.99/kg median; $16.00–$74.22/kg across 11 dated product listings
Identity & Market
Base polymer / chemistryShort-fibre reinforced PEEK. 3DXTech's CarbonX grade is nominally 10 wt% carbon and its FibreX grade 20 wt% glass; LEHVOSS Luvocom 3F PEEK CF 9676 is 15 wt% carbon; Ensinger's machining stock runs to 30 wt% carbon[1][2][3][4]PETG reinforced with chopped carbon fibre[5][6]
Densityg/cm³1.39 (ISO 1183)[1]1.25 (Bambu Lab) to 1.34 (3DXTech), ISO 1183; Prusament 1.27[5][7][6]
Typical priceUSD/kg1 kg-equivalent spools span 448–972; the middle of the market is about 598[2][3][8]1 kg-equivalent spools span 16–74; the middle of the market is about 29[5][9][10][11][12][13][14][15]
Price range across brandsUSD/kg448-972 across formats and filler types; IEMAI 3D CF-PEEK and GF-PEEK 448 at 1 kg, 3DXTech CarbonX PEEK+CF10 598 at 2 kg and FibreX PEEK+GF20 695 at 1 kg, Luvocom 3F PEEK CF 9676 648 at 2 kg[2][3][8][16]16–74 across brands; ELEGOO 16 in a 5 kg pack, Reli3D 17, SUNLU 20, IEMAI 22, Siraya Tech 25, Bambu Lab 32, Sakata 3D 53, 3DXTech 67, Prusament 70, Filament PM 74 on 0.5 kg spools[17][5][2][9][10][11][12][13][14][15]
Market availability1–5Niche, a handful of specialist brands[2][3]Stocked by most mainstream brands[5][2][9][17]
Spool sizes & diameters1.75 and 2.85 mm; 200 g to 2 kg spools[2][3]1.75 and 2.85 mm; 0.75 and 1 kg spools[2][5]
Typical applicationsStiff aerospace and oil-and-gas parts where PEEK alone is not rigid enough[1]Stiff functional parts and fixtures where PETG's toughness is traded for rigidity and a matte finish[5][6]
Diameter tolerance± mmNot documented±0.02 (Prusament)[6]
Printing Parameters
Nozzle temperature°CNot documented240–270 (Bambu Lab); 265 ± 10 (Prusament)[5][6]
Bed temperature°CNot documented65–75 (Bambu Lab); 90 ± 10 (Prusament)[5][6]
Enclosure / chamber requirement1–5Actively heated chamber required[18][19]Open frame fine; draught shield helps — Bambu Lab specifies a 35–50 °C chamber[5]
Recommended chamber temperature°CNot documented35–50 (Bambu Lab)[5]
Part cooling fanNot documented0–60 % (Bambu Lab); 50 % (Prusament)[5][6]
Bed surface & adhesion aidNot documentedTextured PEI or engineering plate with glue (Bambu Lab)[5]
Maximum volumetric flow (mm³/s; see test conditions)mm³/sNot documented11.5 on My Tech Fun's Bambu Lab PETG-CF profile[20]
Warping tendency1–5Moderate — needs adhesion aid or draught shield; the fibre cuts PEEK's crystallisation shrinkage[1]Not documented
Bed-adhesion difficulty1–5Not documentedNeeds the right surface or a thin adhesive[5]
Stringing / oozing tendency1–5Not documentedSlight — the fibre reduces stringing against unfilled PETG[5][21]
Overall printing difficulty1–5Expert / industrial hardware only[18][19]Intermediate — dry filament and a tuned profile; hardened nozzle mandatory[5]
Hardware Wear & Reliability
Nozzle hardness required1–4Hardened steel required[1]Hardened steel required[5]
Abrasiveness1–5Highly abrasive — standard CF composite[1]Highly abrasive — standard CF composite[5]
Nozzle clog risk1–5High — jams from moisture, heat creep or particles; 3DXTech adds a hardened 0.4 mm minimum nozzle and 0.25 mm layers to the mandatory 120 °C pre-dry[22][23]Moderate — needs dry filament and a clean nozzle; 3DXTech specifies a hardened 0.4 mm minimum nozzle and 0.25 mm layers or higher, and Prusa lists composites as a higher clogging risk[24][23]
Heat-creep / jam sensitivity1–5Not documentedSlightly sensitive[21]
Hotend requirementNot documentedHardened steel nozzle; no high-temperature hot-end needed[5][21]
Moisture Behaviour
Moisture absorption (hygroscopicity)1–5Not documentedLow — 0.30 % saturated at 25 °C / 55 % RH (Bambu Lab)[5]
Equilibrium moisture content at ~50 % RH%0.06 in 24 h on extruded CF30 stock (ASTM D570)[4]0.30 saturated at 25 °C / 55 % RH (Bambu Lab); Prusa measures 0.10 after 7 days at 22 % RH[5][6]
Drying temperature & timeNot documented65 °C for 8 h (Bambu Lab)[5]
Symptoms when wetNot documentedBubbling and popping at the nozzle, stringing and a rough surface[25]
Effect of moisture on strengthNo dry-versus-conditioned figures are published; 3DXTech mandates a 120 °C, 4 h pre-dry before every print because trapped water flashes to steam at these nozzle temperatures[22]No dry-versus-conditioned figures published; Bambu Lab states PETG-CF must be properly dried before printing and stored dry after use[5][25]
Storage requirementNot documentedSealed with desiccant; Bambu Lab says store dry after use[5][25]
Mechanical Properties
Tensile strength (XY)MPa105 at break (printed XY, ISO 527, CF10); 121 at yield on extruded CF30 stock (ASTM D638)[1][4]35 ± 5 (Bambu Lab) and 47 ± 2 at yield (Prusament) printed XY, ISO 527; 56 at break for 3DXTech[5][6][7]
Young's modulusMPa8100 (printed XY, ISO 527, CF10) — more than double unfilled PEEK; 6343 on extruded CF30 stock (ASTM D638)[1][4]2460 ± 230 (Bambu Lab) and 1700 (Prusament) printed XY, ISO 527[5][6]
Elongation at break%3 at break (printed XY, ISO 527), against 28 for unfilled PEEK[1][26]4.3 at yield (Prusament, printed XY, ISO 527); 3 at break for 3DXTech[6][7]
Flexural strengthMPa136 (printed XY, ISO 178, CF10); 193 on extruded CF30 stock (ASTM D790)[1][4]68 ± 3 printed horizontal, ISO 178 (Prusament)[6]
Flexural modulusMPa8300 (printed XY, ISO 178, CF10); 7171 on extruded CF30 stock (ASTM D790)[1][4]2300 printed horizontal, 3100 printed vertical, ISO 178 (Prusament)[6]
Other impact dataIzod notched 61.9 J/m on extruded CF30 stock, converted from 1.16 ft-lb/in (ASTM D256)[4]Charpy unnotched 29 ± 6 printed horizontal and 43 ± 8 printed vertical (Prusament, ISO 179-1); Izod 4.91 kJ/m² on My Tech Fun bars[6][20]
Layer adhesion / Z tensileMPaNot documented29 ± 4 printed Z (Bambu Lab, ISO 527); 18 ± 3 by Prusa's interlayer adhesion test; 10.7 on My Tech Fun bars[5][6][20]
Brittleness1–5Brittle — snaps with little warning; elongation falls from 28 % to 3 %[1][26]Brittle — snaps with little warning[7]
Hardness (scale-specific)Shore A / Shore D / RockwellRockwell M107 on extruded PEEK-CF30 stock (ASTM D785), against M100 unfilled[4][27]77 Shore D (Prusa Polymers method)[6]
Creep resistance / sustained load1–5Excellent — holds load for years. Ensinger rates carbon-fibre PEEK stock as very highly creep resistant and specifies 260 °C continuous service[4]Below average — a 12 mm bar sagged to 16.4 mm over 5 days at 1.25 kg, less than plain PETG's 19.4[20]
Fatigue / repeated-flex resistance1–5Good. Victrex rates PEEK for long-term fatigue as well as creep; the fibre cuts elongation at break from 28 % to 3 %, which limits repeated large-strain flexing[28][1][26]Moderate — no CF-grade S-N curve; unfilled printed PETG ran 79 000–193 000 cycles at 30 % of tensile strength[29]
Elasticity / flexibility1–5Rigid[1]Rigid[5]
Z strength as % of XY%Not documented83 (Bambu Lab, printed Z against XY tensile)[5]
Thermal Properties
HDT at 0.45 MPa°C265 (printed XY, ISO 75 at 0.45 MPa, CarbonX PEEK+CF10) against 140 for unfilled PEEK[1][26]74 (Bambu Lab) and 96 (Prusament), ISO 75 at 0.45 MPa[5][6]
HDT at 1.8 MPa°C316 on extruded CF30 stock, converted from 600 °F at 264 psi (ASTM D648)[4]68 (Bambu Lab) and 80 (Prusament), ISO 75 at 1.8 MPa[5][6]
Glass transition (Tg)°C143 (DSC, CarbonX PEEK+CF10) — the fibre does not move the glass transition[1]68 (Bambu Lab) and 80 (3DXTech), DSC[5][7]
Melting point / Vicat°C334 melting on extruded CF30 stock, converted from 633 °F[4]225 melting (Bambu Lab, DSC) — the carbon fibre lets the PET fraction crystallise[5]
Continuous service temperature°C260 long-term on extruded CF30 stock, converted from 500 °F; 300 short term[4]77 — loaded bars begin to move at this temperature, against 61 for Bambu Lab PETG Basic[20]
Thermal expansion (CTE)µm/m·K14.4 (extruded PEEK-CF30 stock, ASTM D696; source states 0.80e-5 in/in/°F) — about a third of unfilled PEEK[4][27]Not documented
Flammability / UL 94UL 94 V-0 on the base resin; Ensinger lists extruded PEEK-CF30 stock as inherently flame resistant[26][4]Flammable; no UL 94 rating published[5]
Environment & Chemical
UV resistance1–5Not documentedModerate — a season or two; the carbon fibre does not add UV stabilisation[30]
Chemical resistanceNot documentedWithstands acids, alkalis, oils and UV exposure, as for unfilled PETG[30]
Food contactNot documentedNot certified for food contact[30]
Biodegradability / compostabilityNot documentedNot biodegradable[30]
RecyclabilityNot documentedFibre-filled PETG is not accepted in household plastic collection[30]
Electrical & ESD propertiesSurface resistance above 10⁹ ohm/sq — not static-dissipative (ASTM D257)[1]Surface resistance above 10⁹ ohm/sq — carbon fibre at this loading is not static-dissipative (3DXTech)[7]
Health & Safety
Fume toxicity1–5Moderate — measurable VOCs and UFPs, ventilation advised. None of these polymers was in the chamber study, and all are processed far above the temperatures it covered[31]Moderate — measurable VOCs and UFPs, ventilation advised[31]
Ventilation / filtration requirement1–5Ventilated room or enclosure recommended[31]Open a window / occasional ventilation[31]
Dust & fibre handling hazardCarbon fibre is bound in the matrix; sanding dust should not be inhaled[1]Carbon fibre is bound in the matrix; sanding dust should not be inhaled[7]
Post-Processing
Sanding & machiningNot documentedSands to a matte finish more readily than unfilled PETG[21]
Gluing & solvent weldingNot documentedCyanoacrylate; no common solvent welds it[21]
Vapour / chemical smoothingNot documentedNo practical vapour smoothing[21]
Support material pairingNot documentedSupport for PLA or its own material (Bambu Lab)[5]
Dimensional accuracy & detailNot documentedMatte finish hides layer lines; stringing is reduced against unfilled PETG[5]
Solvents & Solubility
Soluble in95–98 wt% sulphuric acid dissolves the matrix at 40–70 °C and leaves the fibre. Nothing else touches PEEK.[32][33]No common workshop solvent; dichloromethane — a carcinogen — dissolves the matrix surface, 1,2-dichloroethane destroys it in a week.[34][35]
Softened or crazed byConcentrated nitric, hydrofluoric, hydrobromic and hydriodic acids attack it; DCM, DMSO and THF swell thin-walled sections.[36][33]Acetone (+16 % weight over 1 year at 23 °C), ethyl acetate, toluene and DMF swell and soften it; methanol crazes it.[34]
Solvent welding & smoothing agentNone — no solvent softens PEEK, so parts are joined thermally or mechanically, never chemically.[36][33]Dichloromethane reaches only the resin, so the fibre is left standing proud of the surface. Controlled carcinogen.[35]

Material entries describe families or representative grades, not an interchangeable specification for every spool. Test methods, orientations and conditions may differ. Unknown values are marked “Not documented”. Prices and source dates remain historical snapshots; check the linked guide for product details. Differences highlight text, not a universal winner.

Sources for this comparison

  1. CarbonX Carbon Fiber PEEK Technical Data Sheet v3 3DXTech · 2026-08 · tds
  2. 3DXTech product catalogue 3DXTech · 2026-08 · vendor
  3. 3D4Makers product catalogue 3D4Makers · 2026-08 · vendor
  4. TECAPEEK CF30 black (PEEK-CF30) — stock shape properties Ensinger · 2026-08 · tds
  5. Bambu Filament Technical Data Sheet — PETG-CF Bambu Lab · 2026-08 · tds
  6. Prusament PETG Carbon Fiber Technical Datasheet Prusa Polymers · 2026-08 · tds
  7. CarbonX Carbon Fiber PETG Technical Data Sheet 3DXTech · 2026-08 · tds
  8. IEMAI 3D CF-PEEK 3D Printing Filament — store page IEMAI 3D · 2026-08 · vendor
  9. Printed Solid product catalogue Printed Solid · 2026-08 · vendor
  10. SUNLU PETG-CF (PETG Carbon Fiber) 3D Printer Filament 1 kg SUNLU · 2026-08 · vendor
  11. Fibreheart PETG-CF Pro Filament product page Siraya Tech · 2026-08 · vendor
  12. IEMAI CF-PETG 3D Printing Filament product page IEMAI 3D · 2026-08 · vendor
  13. Reli3D Carbon Fiber PETG Filament 1.75 mm, 1 kg Reli3D (Amazon US) · 2026-08 · vendor
  14. PET-G CF15 Sakata 3D Filaments · 2026-08 · vendor
  15. Filament PM CFJet technical data sheet (TDS CFJet ENG.pdf) Filament PM (Plasty Mladec) · 2026-08 · tds
  16. IEMAI 3D GF-PEEK 3D Printing Filament — store page IEMAI 3D · 2026-08 · vendor
  17. ELEGOO product catalogue ELEGOO · 2026-08 · vendor
  18. Prusament PEI 1010 Technical Datasheet v1.0 Prusa Polymers · 2024-09 · tds
  19. Prusament PEI 1010 — material page Prusa Polymers · 2026-08 · doc
  20. BambuLab PETG Basic vs Translucent vs PETG-CF — results spreadsheet My Tech Fun (Igor Gaspar) · 2026-08 · test
  21. PET and PETG — Ultimate 3D Printing Materials Guide Simplify3D · 2026-08 · doc
  22. CARBONX PEEK+CF10 — product page (print recommendations) 3DXTech · 2026-08 · doc
  23. Composite materials filled with carbon, kevlar or glass Prusa Knowledge Base · 2026-08 · doc
  24. CARBONX PETG+CF — product page (print recommendations) 3DXTech · 2026-08 · doc
  25. Wet Filament — signs, causes and drying Polymaker Wiki · 2026-08 · doc
  26. ThermaX PEEK Technical Data Sheet v3 3DXTech · 2026-08 · tds
  27. TECAPEEK natural (PEEK) — stock shape properties Ensinger · 2026-08 · tds
  28. PEEK polymers — product overview Victrex · 2026-08 · doc
  29. Mechanical Properties of Additively Manufactured Polymeric Materials — PLA and PETG — For Biomechanical Applications Polymers 16(13):1868 · 2024-06 · paper
  30. PETG — material basics Polymaker Wiki · 2026-08 · doc
  31. Emissions of Ultrafine Particles and Volatile Organic Compounds from Commercially Available Desktop Three-Dimensional Printers with Multiple Filaments (Azimi et al.) Environmental Science & Technology 50(3) 1260-1268 · 2016-01 · paper
  32. The Effects of Sulfonated Poly(ether ether ketone) Ion Exchange Preparation Conditions on Membrane Properties Yee, Zhang & Ladewig, Membranes 3(3) 182–195 · 2013-07 · paper
  33. Chemical resistance — resistance of Ensinger plastics to chemicals (DIN 50 014, 23/50) Ensinger · 2026-08 · tds
  34. Eastman Spectar copolyester — Chemical resistance (unstressed bars, 1 year at 23 °C) Eastman Chemical Company · 2026-08 · tds
  35. Improve your 3D prints with chemical smoothing Prusa Research · 2026-08 · doc
  36. What solvents are not compatible with PEEK? — fluidics technical FAQ IDEX Health & Science · 2026-08 · doc