3D Printing Info

Filament comparison

PEEK vs PETG-CF

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

PEEK guideCarbon-fibre PETG (PETG-CF) guide

2 selected · all documented properties

Open these two in the interactive comparisonMore PEEK comparisonsMore PETG-CF comparisons
PEEK vs PETG-CF — documented properties and sources
PropertyPEEKHIGHTEMPCarbon-fibre PETG (PETG-CF)PETG
Market snapshot
Listing priceUSD/kg; dated snapshots$531.87/kg median; $296.14–$770.00/kg across 5 dated product listings$29.99/kg median; $16.00–$74.22/kg across 11 dated product listings
Identity & Market
Base polymer / chemistryPolyether ether ketone — a semi-crystalline polyaryletherketone[1]PETG reinforced with chopped carbon fibre[2][3]
Densityg/cm³1.30 (ISO 1183)[1][4]1.25 (Bambu Lab) to 1.34 (3DXTech), ISO 1183; Prusament 1.27[2][5][3]
Typical priceUSD/kg1 kg-equivalent spools span 296–770; the middle of the market is about 532[6][7][8]1 kg-equivalent spools span 16–74; the middle of the market is about 29[2][9][10][11][12][13][14][15]
Price range across brandsUSD/kg296-770 across brands and spool sizes; 3D4Makers recycled R-PEEK 296 at 750 g, IEMAI 3D 420 at 1 kg, LEHVOSS Luvocom 3F PEEK 9581 532 at 2 kg, 3DXTech ThermaX PEEK 770 at 500 g[6][7][8]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[16][2][6][9][10][11][12][13][14][15]
Market availability1–5Niche, a handful of specialist brands[6][7][4]Stocked by most mainstream brands[2][6][9][16]
Spool sizes & diameters1.75 and 2.85 mm; 200 g to 2 kg spools[6][7][4]1.75 and 2.85 mm; 0.75 and 1 kg spools[6][2]
Typical applicationsAerospace brackets, semiconductor handling, sterilisable medical tooling and downhole parts[1]Stiff functional parts and fixtures where PETG's toughness is traded for rigidity and a matte finish[2][3]
Diameter tolerance± mmNot documented±0.02 (Prusament)[3]
Printing Parameters
Nozzle temperature°C380-400 (3DXTech printed-specimen conditions); Victrex quotes a 340-450 melt range for AM 450 FIL[1][4]240–270 (Bambu Lab); 265 ± 10 (Prusament)[2][3]
Bed temperature°C130–140 (3DXTech)[1]65–75 (Bambu Lab); 90 ± 10 (Prusament)[2][3]
Enclosure / chamber requirement1–5Actively heated chamber required[17][18]Open frame fine; draught shield helps — Bambu Lab specifies a 35–50 °C chamber[2]
Recommended chamber temperature°CNot less than 150 for semi-crystalline printing (Victrex AM 450 FIL); bed above 150[4]35–50 (Bambu Lab)[2]
Part cooling fanNot documented0–60 % (Bambu Lab); 50 % (Prusament)[2][3]
Bed surface & adhesion aidNot documentedTextured PEI or engineering plate with glue (Bambu Lab)[2]
Maximum volumetric flow (mm³/s; see test conditions)mm³/sNot documented11.5 on My Tech Fun's Bambu Lab PETG-CF profile[19]
Warping tendency1–5Severe — heated chamber needed[17]Not documented
Bed-adhesion difficulty1–5Very difficult — special plates or slurry required[17]Needs the right surface or a thin adhesive[2]
Stringing / oozing tendency1–5Not documentedSlight — the fibre reduces stringing against unfilled PETG[2][20]
Overall printing difficulty1–5Expert / industrial hardware only[17][18]Intermediate — dry filament and a tuned profile; hardened nozzle mandatory[2]
Extruder requirementAn all-metal hot end rated above 400 °C and a heated chamber; 3DXTech tests at 0.25 mm layer height on a 0.4 mm nozzle[1][17]Not documented
Hardware Wear & Reliability
Nozzle hardness required1–4Brass fine indefinitely for unfilled grades, but brass softens near these nozzle temperatures — hardened or plated hot ends are the norm[17]Hardened steel required[2]
Abrasiveness1–5Non-abrasive when unfilled[1]Highly abrasive — standard CF composite[2]
Nozzle clog risk1–5Moderate — needs dry filament and a clean nozzle; 3DXTech lists no special nozzle concerns but a mandatory 120 °C pre-dry before every print[21]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[22][23]
Heat-creep / jam sensitivity1–5Not documentedSlightly sensitive[20]
Hotend requirementNot documentedHardened steel nozzle; no high-temperature hot-end needed[2][20]
Moisture Behaviour
Moisture absorption (hygroscopicity)1–5Not documentedLow — 0.30 % saturated at 25 °C / 55 % RH (Bambu Lab)[2]
Equilibrium moisture content at ~50 % RH%0.45 at saturation, 23 °C (ISO 62); 0.55 at 100 °C[4]0.30 saturated at 25 °C / 55 % RH (Bambu Lab); Prusa measures 0.10 after 7 days at 22 % RH[2][3]
Drying temperature & time120 °C for 5 h, target below 0.020 % moisture (Victrex AM 450 FIL)[4]65 °C for 8 h (Bambu Lab)[2]
Symptoms when wetNot documentedBubbling and popping at the nozzle, stringing and a rough surface[24]
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[21]No dry-versus-conditioned figures published; Bambu Lab states PETG-CF must be properly dried before printing and stored dry after use[2][24]
Storage requirementNot documentedSealed with desiccant; Bambu Lab says store dry after use[2][24]
Mechanical Properties
Tensile strength (XY)MPa60-100 (printed XY): Victrex AM 450 FIL 60-80 at yield and 3DXTech 100, both ISO 527; 98 at yield injection-moulded[1][4]35 ± 5 (Bambu Lab) and 47 ± 2 at yield (Prusament) printed XY, ISO 527; 56 at break for 3DXTech[2][3][5]
Young's modulusMPa3000-4000 (printed XY, ISO 527, Victrex AM 450 FIL); 3720 (3DXTech); 4000 injection-moulded[1][4]2460 ± 230 (Bambu Lab) and 1700 (Prusament) printed XY, ISO 527[2][3]
Elongation at break%28 (printed XY, ISO 527) — remarkably ductile for a high-temperature polymer[1]4.3 at yield (Prusament, printed XY, ISO 527); 3 at break for 3DXTech[3][5]
Flexural strengthMPa130 (printed XY, ISO 178)[1]68 ± 3 printed horizontal, ISO 178 (Prusament)[3]
Flexural modulusMPa2700 (printed XY, ISO 178)[1]2300 printed horizontal, 3100 printed vertical, ISO 178 (Prusament)[3]
Charpy impact, notchedkJ/m²6.0 (injection-moulded, ISO 179/1eA); unnotched does not break[4]Not documented
Other impact dataIzod notched 7.0 kJ/m2 injection-moulded (ISO 180/A). Printed anisotropy is extreme: VICTREX AM 200 on a Stratasys F900 gives Izod notched 1380-1530 J/m XZ against 30-62 J/m ZX (ASTM D256)[4][25]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[3][19]
Layer adhesion / Z tensileMPa20-85 at yield (printed ZX, ISO 527, Victrex AM 450 FIL); the spread is set by chamber temperature and weld quality[4]29 ± 4 printed Z (Bambu Lab, ISO 527); 18 ± 3 by Prusa's interlayer adhesion test; 10.7 on My Tech Fun bars[2][3][19]
Brittleness1–5Tough — absorbs impact, yields before breaking[1]Brittle — snaps with little warning[5]
Hardness (scale-specific)Shore A / Shore D / RockwellShore D 84.5 (injection-moulded, ISO 868); Rockwell M100 / R125 on extruded PEEK stock (ASTM D785)[4][26]77 Shore D (Prusa Polymers method)[3]
Creep resistance / sustained load1–5Excellent — holds load for years. Victrex rates PEEK for long-term creep; injection-moulded flexural stress at 3.5 % strain falls only from 125 MPa at 23 °C to 85 MPa at 125 °C, and extruded stock is rated to 249 °C continuous[27][4][26]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[19]
Fatigue / repeated-flex resistance1–5Excellent — living hinges viable. Victrex rates PEEK for long-term fatigue as well as creep[27]Moderate — no CF-grade S-N curve; unfilled printed PETG ran 79 000–193 000 cycles at 30 % of tensile strength[28]
Elasticity / flexibility1–5Rigid[1]Rigid[2]
Z strength as % of XY%71-84 (VICTREX AM 200 LMPAEK printed on the Stratasys F900 and Fortus 450mc, ZX against XZ tensile yield, ASTM D638); unfilled PEEK's own ZX spread is wider[25]83 (Bambu Lab, printed Z against XY tensile)[2]
Thermal Properties
HDT at 0.45 MPa°C140 (printed XY, ISO 75 at 0.45 MPa, 3DXTech)[1]74 (Bambu Lab) and 96 (Prusament), ISO 75 at 0.45 MPa[2][3]
HDT at 1.8 MPa°C152 (unannealed, ISO 75-2/Af, Victrex AM 450 FIL); 160 on extruded stock (ASTM D648 at 264 psi)[4][26]68 (Bambu Lab) and 80 (Prusament), ISO 75 at 1.8 MPa[2][3]
Glass transition (Tg)°C143 (DSC, 3DXTech); Victrex gives onset 143 and midpoint 150 (ISO 11357-2)[1][4]68 (Bambu Lab) and 80 (3DXTech), DSC[2][5]
Melting point / Vicat°C343 melting (ISO 11357-3, Victrex); VICTREX AM 200 LMPAEK melts at 303[4][25]225 melting (Bambu Lab, DSC) — the carbon fibre lets the PET fraction crystallise[2]
Continuous service temperature°C240 UL 746B relative thermal index, strength (RTI electrical 260, impact 180); Ensinger rates extruded PEEK stock at 249 long term[4][26]77 — loaded bars begin to move at this temperature, against 61 for Bambu Lab PETG Basic[19]
Thermal expansion (CTE)µm/m·K37.8 (extruded PEEK stock, 23-60 °C, ASTM E831; source states 2.1e-5 in/in/°F), rising to 41.9 at 60-100 °C and 55.8 at 100-150 °C[26]Not documented
Flammability / UL 94UL 94 V-0 at 1.5 mm on the base resin; glow-wire flammability index 960 °C at 2.0 mm (IEC 60695-2-12)[1][4]Flammable; no UL 94 rating published[2]
Environment & Chemical
UV resistance1–5Not documentedModerate — a season or two; the carbon fibre does not add UV stabilisation[29]
Chemical resistanceOutstanding — resistant to almost all solvents and to steam sterilisation[1]Withstands acids, alkalis, oils and UV exposure, as for unfilled PETG[29]
Water / humidity resistance in service1–5Excellent — essentially unaffected; 0.45 % water at saturation and resistant to steam sterilisation[4][1]Not documented
Food contactNot documentedNot certified for food contact[29]
Biodegradability / compostabilityNot documentedNot biodegradable[29]
RecyclabilityNot documentedFibre-filled PETG is not accepted in household plastic collection[29]
Electrical & ESD propertiesNot documentedSurface resistance above 10⁹ ohm/sq — carbon fibre at this loading is not static-dissipative (3DXTech)[5]
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[30]Moderate — measurable VOCs and UFPs, ventilation advised[30]
Ventilation / filtration requirement1–5Ventilated room or enclosure recommended[30]Open a window / occasional ventilation[30]
Dust & fibre handling hazardNot documentedCarbon fibre is bound in the matrix; sanding dust should not be inhaled[5]
Post-Processing
Sanding & machiningNot documentedSands to a matte finish more readily than unfilled PETG[20]
Gluing & solvent weldingNot documentedCyanoacrylate; no common solvent welds it[20]
Vapour / chemical smoothingNot documentedNo practical vapour smoothing[20]
Support material pairingNot documentedSupport for PLA or its own material (Bambu Lab)[2]
Dimensional accuracy & detailNot documentedMatte finish hides layer lines; stringing is reduced against unfilled PETG[2]
Solvents & Solubility
Soluble in95–98 wt% sulphuric acid dissolves it — 10 g per 100 mL at 40–70 °C gives a dark red solution. Laboratory route only.[31][32]No common workshop solvent; dichloromethane — a carcinogen — dissolves the matrix surface, 1,2-dichloroethane destroys it in a week.[33][34]
Softened or crazed byConcentrated nitric, hydrofluoric, hydrobromic and hydriodic acids attack it; DCM, DMSO and THF swell thin-walled sections.[35][32]Acetone (+16 % weight over 1 year at 23 °C), ethyl acetate, toluene and DMF swell and soften it; methanol crazes it.[33]
Solvent welding & smoothing agentNone — no solvent softens PEEK, so parts are joined thermally or mechanically, never chemically.[35][32]Dichloromethane reaches only the resin, so the fibre is left standing proud of the surface. Controlled carcinogen.[34]

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. ThermaX PEEK Technical Data Sheet v3 3DXTech · 2026-08 · tds
  2. Bambu Filament Technical Data Sheet — PETG-CF Bambu Lab · 2026-08 · tds
  3. Prusament PETG Carbon Fiber Technical Datasheet Prusa Polymers · 2026-08 · tds
  4. VICTREX AM 450 FIL — datasheet Victrex · 2025-12 · tds
  5. CarbonX Carbon Fiber PETG Technical Data Sheet 3DXTech · 2026-08 · tds
  6. 3DXTech product catalogue 3DXTech · 2026-08 · vendor
  7. 3D4Makers product catalogue 3D4Makers · 2026-08 · vendor
  8. IEMAI 3D 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. ELEGOO product catalogue ELEGOO · 2026-08 · vendor
  17. Prusament PEI 1010 Technical Datasheet v1.0 Prusa Polymers · 2024-09 · tds
  18. Prusament PEI 1010 — material page Prusa Polymers · 2026-08 · doc
  19. BambuLab PETG Basic vs Translucent vs PETG-CF — results spreadsheet My Tech Fun (Igor Gaspar) · 2026-08 · test
  20. PET and PETG — Ultimate 3D Printing Materials Guide Simplify3D · 2026-08 · doc
  21. ThermaX PEEK — product page 3DXTech · 2026-08 · vendor
  22. CARBONX PETG+CF — product page (print recommendations) 3DXTech · 2026-08 · doc
  23. Composite materials filled with carbon, kevlar or glass Prusa Knowledge Base · 2026-08 · doc
  24. Wet Filament — signs, causes and drying Polymaker Wiki · 2026-08 · doc
  25. VICTREX AM 200 — FDM Material Data Sheet Stratasys · 2024-04 · tds
  26. TECAPEEK natural (PEEK) — stock shape properties Ensinger · 2026-08 · tds
  27. PEEK polymers — product overview Victrex · 2026-08 · doc
  28. Mechanical Properties of Additively Manufactured Polymeric Materials — PLA and PETG — For Biomechanical Applications Polymers 16(13):1868 · 2024-06 · paper
  29. PETG — material basics Polymaker Wiki · 2026-08 · doc
  30. 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
  31. 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
  32. Chemical resistance — resistance of Ensinger plastics to chemicals (DIN 50 014, 23/50) Ensinger · 2026-08 · tds
  33. Eastman Spectar copolyester — Chemical resistance (unstressed bars, 1 year at 23 °C) Eastman Chemical Company · 2026-08 · tds
  34. Improve your 3D prints with chemical smoothing Prusa Research · 2026-08 · doc
  35. What solvents are not compatible with PEEK? — fluidics technical FAQ IDEX Health & Science · 2026-08 · doc