3D Printing Info

Filament comparison

PEEK-CF vs PETG

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

Fibre-reinforced PEEK guidePETG guide

2 selected · all documented properties

Open these two in the interactive comparisonMore PEEK-CF comparisonsMore PETG comparisons
PEEK-CF vs PETG — documented properties and sources
PropertyFibre-reinforced PEEKHIGHTEMPPETGPETG
Market snapshot
Listing priceUSD/kg; dated snapshots$597.50/kg median; $448.00–$695.00/kg across 5 dated product listings$19.99/kg median; $8.99–$69.99/kg across 21 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]Polyethylene terephthalate glycol copolymer — PET with a glycol comonomer that suppresses crystallisation[5][6]
Densityg/cm³1.39 (ISO 1183)[1]1.24–1.30 (ISO 1183)[5][6][7][8]
Typical priceUSD/kg1 kg-equivalent spools span 448–972; the middle of the market is about 598[2][3][9]1 kg spools cluster near 20[10][11][12]
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][9][13]12–70 across brands; IEMAI 12, ELEGOO 14, CHCKX 14, Bambu Lab 18–20, Hatchbox 26, Prusament 38, Prusament PETG V0 70[10][11][14][12][15][16]
Market availability1–5Niche, a handful of specialist brands[2][3]Ubiquitous, every brand and retailer[10][11][17][12]
Spool sizes & diameters1.75 and 2.85 mm; 200 g to 2 kg spools[2][3]1.75 and 2.85 mm; 0.75, 0.8 and 1 kg spools plus spool-less refills[11][12]
Typical applicationsStiff aerospace and oil-and-gas parts where PEEK alone is not rigid enough[1]Functional parts, enclosures and outdoor fittings that need more toughness and heat tolerance than PLA[5][6]
Diameter tolerance± mmNot documented±0.02 (Prusament)[5]
Printing Parameters
Nozzle temperature°CNot documented230–260 across brands; Prusament 250 ± 10, Polymaker 240–260[5][6][8]
Bed temperature°CNot documented60–90; Prusament 80 ± 10, Polymaker 60–70[5][8]
Enclosure / chamber requirement1–5Actively heated chamber required[18][19]Open frame is fine[8]
Part cooling fanNot documentedAround 50 %; Polymaker specifies 20–60 %, less than PLA to protect layer bonding[5][8]
Bed surface & adhesion aidNot documentedTextured PEI, satin or powder-coated sheets. On smooth PEI a glue stick is used as a release agent, not an adhesive — PETG bonds to bare PEI hard enough to tear the sheet[5][8]
Maximum volumetric flow (mm³/s; see test conditions)mm³/sNot documented8–15 (PrusaSlicer guidance); My Tech Fun ran Bambu Lab PETG Basic at 13 mm³/s[20][21]
Warping tendency1–5Moderate — needs adhesion aid or draught shield; the fibre cuts PEEK's crystallisation shrinkage[1]Slight — corner lift on large flat parts[5][8]
Bed-adhesion difficulty1–5Not documentedNeeds the right surface or a thin adhesive — the problem is releasing the part, not sticking it[5]
Stringing / oozing tendency1–5Not documentedModerate — retraction tuning needed[5][8]
Overall printing difficulty1–5Expert / industrial hardware only[18][19]Easy — minor profile tuning[8]
Hardware Wear & Reliability
Nozzle hardness required1–4Hardened steel required[1]Brass fine indefinitely[20]
Abrasiveness1–5Highly abrasive — standard CF composite[1]Non-abrasive[8]
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]Low — no special hot-end required and clogging is not among the listed drawbacks; Prusa lists no drybox and no hardened nozzle[24][25]
Heat-creep / jam sensitivity1–5Not documentedSlightly sensitive[24]
Hotend requirementNot documentedNo special hot-end required[24]
Moisture Behaviour
Moisture absorption (hygroscopicity)1–5Not documentedModerate (0.3–0.8 %) — Bambu Lab reports 0.40 % saturated at 25 °C / 55 % RH; Prusa measures only 0.07 % in 24 h and 0.10 % in 7 days at the drier 22 % RH[5][26]
Equilibrium moisture content at ~50 % RH%0.06 in 24 h on extruded CF30 stock (ASTM D570)[4]0.10 after 7 days at 24 °C / 22 % RH (Prusa Polymers); 0.40 saturated at 25 °C / 55 % RH (Bambu Lab)[5][26]
Drying temperature & timeNot documented60–65 °C for 6–8 h[8][26]
Symptoms when wetNot documentedBubbling and popping at the nozzle, stringing and a rough surface[5]
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]Polymaker groups PETG with nylon, PVA and TPU as highly hygroscopic and shows a before-and-after-drying comparison; the loss appears as poor layer adhesion and weak, brittle layers rather than a published dry-versus-conditioned figure[27]
Storage requirementNot documentedSealed with desiccant; Polymaker groups PETG with the highly hygroscopic materials[27][28]
Mechanical Properties
Tensile strength (XY)MPa105 at break (printed XY, ISO 527, CF10); 121 at yield on extruded CF30 stock (ASTM D638)[1][4]38–51 (printed XY, ISO 527); Prusament 47 ± 2 at yield; 62 on My Tech Fun 4×4 mm bars[5][6][7][29]
Young's modulusMPa8100 (printed XY, ISO 527, CF10) — more than double unfilled PEEK; 6343 on extruded CF30 stock (ASTM D638)[1][4]1500–2311 (printed XY, ISO 527)[5][6][7][8]
Elongation at break%3 at break (printed XY, ISO 527), against 28 for unfilled PEEK[1][30]5.2–9.3 at break (printed XY, ISO 527); Prusament 5.1 at yield[6][7][8][5]
Flexural strengthMPa136 (printed XY, ISO 178, CF10); 193 on extruded CF30 stock (ASTM D790)[1][4]58–80 (printed XY, ISO 178); Prusament 66 ± 2[5][6][7][8]
Flexural modulusMPa8300 (printed XY, ISO 178, CF10); 7171 on extruded CF30 stock (ASTM D790)[1][4]1068–2277 (printed XY, ISO 178)[5][6][7][8]
Charpy impact, notchedkJ/m²Not documented2.6 (PolyLite) to 11.6 (PolyMax) printed XY, ISO 179, notched; Prusament 6 ± 1[6][7][5]
Other impact dataIzod notched 61.9 J/m on extruded CF30 stock, converted from 1.16 ft-lb/in (ASTM D256)[4]Charpy unnotched does not break on Prusa's 4 J pendulum (ISO 179-1); Izod 3.37 kJ/m² on My Tech Fun printed bars[5][29]
Layer adhesion / Z tensileMPaNot documented18 ± 4 (Prusa interlayer adhesion test); 42.8 printed Z for PolyLite PETG; 33 on My Tech Fun bars[5][6][29]
Brittleness1–5Brittle — snaps with little warning; elongation falls from 28 % to 3 %[1][30]Moderate[5][6]
Hardness (scale-specific)Shore A / Shore D / RockwellRockwell M107 on extruded PEEK-CF30 stock (ASTM D785), against M100 unfilled[4][31]74 Shore D (Prusa Polymers method); measured on printed bars at 68.2 for Extrudr PETG, 72 for Fiberlogy PETG and 72.8 for Prusament PETG[5][29][32][33]
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 18.2 mm (Fiberlogy) and 19.4 mm (Bambu Lab Basic) over 5 days at 1.25 kg[29][21]
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[34][1][30]Moderate — 79 000–193 000 cycles at 30 % of tensile strength, about three times printed PLA (R = 0.2, 7 Hz)[35]
Elasticity / flexibility1–5Rigid[1]Slightly flexible in thin sections[5]
Z strength as % of XY%Not documented84 (PolyLite, printed Z against XY tensile)[6]
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][30]68 (Prusament) to 78 (PolyLite), ISO 75 at 0.45 MPa[5][6][8]
HDT at 1.8 MPa°C316 on extruded CF30 stock, converted from 600 °F at 264 psi (ASTM D648)[4]65 (Polymaker) to 75 (PolyLite), ISO 75 at 1.8 MPa; Prusament 68[5][6][8]
Glass transition (Tg)°C143 (DSC, CarbonX PEEK+CF10) — the fibre does not move the glass transition[1]71–81 (DSC)[6][7][8]
Melting point / Vicat°C334 melting on extruded CF30 stock, converted from 633 °F[4]Amorphous — no melting point; Vicat 75–84 (ISO 306)[6][7][8]
Continuous service temperature°C260 long-term on extruded CF30 stock, converted from 500 °F; 300 short term[4]61–66 — loaded bars begin to move at this temperature across six grades from four brands; Prusa publishes 68 for Prusament PETG[29][32][33][21][36]
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][31]65 at 30 °C (neat PETG, large-format printed bead, TMA)[37]
Flammability / UL 94UL 94 V-0 on the base resin; Ensinger lists extruded PEEK-CF30 stock as inherently flame resistant[30][4]Flammable; no UL 94 rating published for standard PETG, though flame-retardant V0 grades exist[38][28]
Environment & Chemical
UV resistance1–5Not documentedModerate — a season or two[5]
Chemical resistanceNot documentedWithstands acids, alkalis, oils and UV exposure — Polymaker names outdoor use as a result[28]
Water / humidity resistance in service1–5Not documentedGood — minor absorption[5]
Food contactNot documentedPET is the polymer of drinks bottles, but printed layer grooves harbour bacteria and no filament here carries a food-contact certification[28]
Biodegradability / compostabilityNot documentedNot biodegradable[28]
RecyclabilityNot documentedPET is widely recycled as bottle stock, but printed PETG waste is not accepted in household collection[28]
Electrical & ESD propertiesSurface resistance above 10⁹ ohm/sq — not static-dissipative (ASTM D257)[1]Not documented
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[39]Moderate — measurable VOCs and UFPs, ventilation advised[39]
Ultrafine-particle emission rateparticles/minNot documented≈5 × 10⁹ median for the PET-based T-Glase filament in the same chamber study, against ≈1 × 10⁸ for PLA[39]
Ventilation / filtration requirement1–5Ventilated room or enclosure recommended[39]Open a window / occasional ventilation[39]
Dust & fibre handling hazardCarbon fibre is bound in the matrix; sanding dust should not be inhaled[1]Not documented
Post-Processing
Sanding & machiningNot documentedSands poorly — the material is tough and gums rather than powders[24]
Painting & finishingNot documentedPaint adheres poorly without abrasion and a primer[5]
Gluing & solvent weldingNot documentedCyanoacrylate; no common solvent welds PETG cleanly[24]
Vapour / chemical smoothingNot documentedNo practical vapour smoothing[5]
Support material pairingNot documentedPrints its own supports; Polymaker rates PolyDissolve S1 for PETG[24]
Dimensional accuracy & detailNot documentedStringing and blobbing are the usual accuracy limits, not shrinkage[5][8]
Solvents & Solubility
Soluble in95–98 wt% sulphuric acid dissolves the matrix at 40–70 °C and leaves the fibre. Nothing else touches PEEK.[40][41]No common workshop solvent; 1,2-dichloroethane destroys it inside a week and dichloromethane — a carcinogen — dissolves the surface.[42][43]
Softened or crazed byConcentrated nitric, hydrofluoric, hydrobromic and hydriodic acids attack it; DCM, DMSO and THF swell thin-walled sections.[44][41]Acetone (+16 % weight over 1 year at 23 °C), ethyl acetate, toluene and DMF swell and soften it; methanol crazes it.[42]
Solvent welding & smoothing agentNone — no solvent softens PEEK, so parts are joined thermally or mechanically, never chemically.[44][41]Dichloromethane brushed on is the only agent that smooths PETG — a controlled carcinogen, not workshop stock.[43]

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. Prusament PETG Technical Datasheet v1.1 Prusa Polymers · 2022-02 · tds
  6. PolyLite PETG Technical Data Sheet Polymaker Wiki · 2026-08 · tds
  7. PolyMax PETG Technical Data Sheet Polymaker Wiki · 2026-08 · tds
  8. Polymaker PETG Technical Data Sheet Polymaker Wiki · 2026-08 · tds
  9. IEMAI 3D CF-PEEK 3D Printing Filament — store page IEMAI 3D · 2026-08 · vendor
  10. PETG Basic — product page Bambu Lab US Store · 2026-08 · vendor
  11. Polymaker product catalogue Polymaker · 2026-08 · vendor
  12. Printed Solid product catalogue Printed Solid · 2026-08 · vendor
  13. IEMAI 3D GF-PEEK 3D Printing Filament — store page IEMAI 3D · 2026-08 · vendor
  14. Black PETG Filament 1.75 mm 1 kg — product data Hatchbox · 2026-08 · vendor
  15. IEMAI PETG 3D Printing Filament product page IEMAI 3D · 2026-08 · vendor
  16. CHCKX PETG 3D Printer Filament 1.75 mm 1 kg, Black CHCKX (Amazon US) · 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. Max volumetric speed Prusa Knowledge Base · 2026-08 · doc
  21. BambuLab PETG Basic vs Translucent vs PETG-CF — results spreadsheet My Tech Fun (Igor Gaspar) · 2026-08 · test
  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. PET and PETG — Ultimate 3D Printing Materials Guide Simplify3D · 2026-08 · doc
  25. Filament Material Guide Prusa Knowledge Base · 2026-08 · doc
  26. Bambu Filament Technical Data Sheet — PETG HF Bambu Lab · 2026-08 · tds
  27. Wet Filament — signs, causes and drying Polymaker Wiki · 2026-08 · doc
  28. PETG — material basics Polymaker Wiki · 2026-08 · doc
  29. PCTG vs PETG comparison — results spreadsheet My Tech Fun (Igor Gaspar) · 2026-08 · test
  30. ThermaX PEEK Technical Data Sheet v3 3DXTech · 2026-08 · tds
  31. TECAPEEK natural (PEEK) — stock shape properties Ensinger · 2026-08 · tds
  32. Extrudr PETG vs PCTG vs XPETG-CF — results spreadsheet My Tech Fun (Igor Gaspar) · 2026-08 · test
  33. Prusament PETG-CF vs PETG V0 vs PETG — results spreadsheet My Tech Fun (Igor Gaspar) · 2026-08 · test
  34. PEEK polymers — product overview Victrex · 2026-08 · doc
  35. Mechanical Properties of Additively Manufactured Polymeric Materials — PLA and PETG — For Biomechanical Applications Polymers 16(13):1868 · 2024-06 · paper
  36. Prusament PETG — material page Prusa Polymers · 2026-08 · doc
  37. Effects of Fiber Orientation on the Coefficient of Thermal Expansion of Fiber-Filled Polymer Systems in Large Format Polymer Extrusion-Based Additive Manufacturing Materials 15(8):2764 · 2022-04 · paper
  38. Prusament PETG V0 Technical Datasheet Prusa Polymers · 2026-08 · tds
  39. 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
  40. 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
  41. Chemical resistance — resistance of Ensinger plastics to chemicals (DIN 50 014, 23/50) Ensinger · 2026-08 · tds
  42. Eastman Spectar copolyester — Chemical resistance (unstressed bars, 1 year at 23 °C) Eastman Chemical Company · 2026-08 · tds
  43. Improve your 3D prints with chemical smoothing Prusa Research · 2026-08 · doc
  44. What solvents are not compatible with PEEK? — fluidics technical FAQ IDEX Health & Science · 2026-08 · doc