3D Printing Info

Filament comparison

PA blend vs PETG-CF

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

PA6/66 copolymer blends guideCarbon-fibre PETG (PETG-CF) guide

2 selected · all documented properties

Open these two in the interactive comparisonMore PA blend comparisonsMore PETG-CF comparisons
PA blend vs PETG-CF — documented properties and sources
PropertyPA6/66 copolymer blendsPACarbon-fibre PETG (PETG-CF)PETG
Market snapshot
Listing priceUSD/kg; dated snapshots$65.62/kg median; $62.00–$113.33/kg across 4 dated product listings$29.99/kg median; $16.00–$74.22/kg across 11 dated product listings
Identity & Market
Base polymer / chemistryPA6/66 copolymer — a nylon alloy that lowers the melting point and improves printability against straight PA6[1][2]PETG reinforced with chopped carbon fibre[3][4]
Densityg/cm³1.12 (ISO 1183, Polymaker CoPA)[1]1.25 (Bambu Lab) to 1.34 (3DXTech), ISO 1183; Prusament 1.27[3][5][4]
Typical priceUSD/kg1 kg-equivalent spools cluster near 65[6][7][8]1 kg-equivalent spools span 16–74; the middle of the market is about 29[3][9][10][11][12][13][14][15]
Price range across brandsUSD/kg62–113 across brands; add:north Adura 62, PrimaCreator NylonPower PA6/66 65 at 500 g, Polymaker CoPA 67, 3DXTech AmideX Nylon 6-66 113[6][16][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[17][3][16][9][10][11][12][13][14][15]
Market availability1–5Available from several mainstream brands[6][16]Stocked by most mainstream brands[3][16][9][17]
Spool sizes & diameters1.75 and 2.85 mm; 0.5, 0.75 and 1 kg spools[6][16][7][8]1.75 and 2.85 mm; 0.75 and 1 kg spools[16][3]
Typical applicationsGeneral-purpose nylon parts and, unusually, CoPA can support itself if the support is removed before it absorbs moisture[1]Stiff functional parts and fixtures where PETG's toughness is traded for rigidity and a matte finish[3][4]
Diameter tolerance± mmNot documented±0.02 (Prusament)[4]
Printing Parameters
Nozzle temperature°C250–270 (Polymaker CoPA)[1]240–270 (Bambu Lab); 265 ± 10 (Prusament)[3][4]
Bed temperature°C25–50 (Polymaker CoPA)[1]65–75 (Bambu Lab); 90 ± 10 (Prusament)[3][4]
Enclosure / chamber requirement1–5Enclosure required (passive) — Polymaker specifies a chamber at ambient temperature[1]Open frame fine; draught shield helps — Bambu Lab specifies a 35–50 °C chamber[3]
Recommended chamber temperature°CNot documented35–50 (Bambu Lab)[3]
Part cooling fanNot documented0–60 % (Bambu Lab); 50 % (Prusament)[3][4]
Bed surface & adhesion aidNot documentedTextured PEI or engineering plate with glue (Bambu Lab)[3]
Maximum volumetric flow (mm³/s; see test conditions)mm³/s16 at Polymaker's 200 mm/s cap on a 0.4 mm nozzle at 0.2 mm layer[1][18]11.5 on My Tech Fun's Bambu Lab PETG-CF profile[19]
Bed-adhesion difficulty1–5Not documentedNeeds the right surface or a thin adhesive[3]
Stringing / oozing tendency1–5Not documentedSlight — the fibre reduces stringing against unfilled PETG[3][20]
Overall printing difficulty1–5Advanced — enclosure, hardware upgrades, tuning; must be kept below 20 % RH throughout[1][21]Intermediate — dry filament and a tuned profile; hardened nozzle mandatory[3]
Hardware Wear & Reliability
Nozzle hardness required1–4Brass fine indefinitely for unfilled grades[22]Hardened steel required[3]
Abrasiveness1–5Non-abrasive when unfilled[22]Highly abrasive — standard CF composite[3]
Nozzle clog risk1–5Very high — frequent jams without careful setup[23][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[24][25]
Heat-creep / jam sensitivity1–5Not documentedSlightly sensitive[20]
Hotend requirementNot documentedHardened steel nozzle; no high-temperature hot-end needed[3][20]
Moisture Behaviour
Moisture absorption (hygroscopicity)1–5Very high (>2 %) — Polymaker's own wet-state specimens reached 6.16 % moisture content after 48 h immersion at 60 °C[1][21]Low — 0.30 % saturated at 25 °C / 55 % RH (Bambu Lab)[3]
Equilibrium moisture content at ~50 % RH%Not documented0.30 saturated at 25 °C / 55 % RH (Bambu Lab); Prusa measures 0.10 after 7 days at 22 % RH[3][4]
Drying temperature & time100 °C for 8 h (Polymaker CoPA)[1]65 °C for 8 h (Bambu Lab)[3]
Symptoms when wetPopping and cracking during extrusion, then hard-to-diagnose defects[23]Bubbling and popping at the nozzle, stringing and a rough surface[21]
Effect of moisture on strengthMeasured dry against wet on printed specimens at 6.16 % moisture (Polymaker CoPA): tensile 78.0 → 34.3 MPa, Young's modulus 2703 → 724 MPa, flexural strength 109.8 → 22.6 MPa, while notched Charpy rises 6.9 → 27.7 kJ/m² and elongation 12.7 → 13.2 %[1][23]No dry-versus-conditioned figures published; Bambu Lab states PETG-CF must be properly dried before printing and stored dry after use[3][21]
Storage requirementPolymaker states CoPA must always be stored and used below 20 % relative humidity[1]Sealed with desiccant; Bambu Lab says store dry after use[3][21]
Hydrolysis at melt temperaturePolymaker requires a 100 °C dry for 8 h and storage below 20 % RH; no molecular-weight loss figure is published, and the published wet data is conditioning rather than melt hydrolysis[1][26]Not documented
Mechanical Properties
Tensile strength (XY)MPa78.0 ± 0.7 printed XY dry and 34.3 ± 2.5 wet, ISO 527 (Polymaker CoPA)[1]35 ± 5 (Bambu Lab) and 47 ± 2 at yield (Prusament) printed XY, ISO 527; 56 at break for 3DXTech[3][4][5]
Young's modulusMPa2703 ± 259 printed XY dry and 724 ± 61 wet, ISO 527 (Polymaker CoPA)[1]2460 ± 230 (Bambu Lab) and 1700 (Prusament) printed XY, ISO 527[3][4]
Elongation at break%12.7 ± 2.1 printed XY dry and 13.2 ± 2.3 wet, ISO 527 (Polymaker CoPA)[1]4.3 at yield (Prusament, printed XY, ISO 527); 3 at break for 3DXTech[4][5]
Flexural strengthMPa109.8 ± 1.3 printed XY dry and 22.6 ± 0.5 wet, ISO 178 (Polymaker CoPA)[1]68 ± 3 printed horizontal, ISO 178 (Prusament)[4]
Flexural modulusMPa2510 ± 25 printed XY dry and 636 ± 11 wet, ISO 178 (Polymaker CoPA)[1]2300 printed horizontal, 3100 printed vertical, ISO 178 (Prusament)[4]
Charpy impact, notchedkJ/m²6.9 ± 1.4 printed XY dry and 27.7 ± 1.2 wet, ISO 179 notched (Polymaker CoPA) — impact quadruples when conditioned[1]Not documented
Other impact dataNot documentedCharpy unnotched 29 ± 6 printed horizontal and 43 ± 8 printed vertical (Prusament, ISO 179-1); Izod 4.91 kJ/m² on My Tech Fun bars[4][19]
Layer adhesion / Z tensileMPa45.8 ± 1.5 printed Z dry, falling to 13.7 ± 1.2 wet, ISO 527 (Polymaker CoPA)[1]29 ± 4 printed Z (Bambu Lab, ISO 527); 18 ± 3 by Prusa's interlayer adhesion test; 10.7 on My Tech Fun bars[3][4][19]
Brittleness1–5Tough — absorbs impact, yields before breaking[1]Brittle — snaps with little warning[5]
Hardness (scale-specific)Shore A / Shore D / RockwellShore D 86 and Rockwell 85 (108) — the source does not name the scales on extruded unfilled PA66 stock (ASTM D2240, D785)[27]77 Shore D (Prusa Polymers method)[4]
Creep resistance / sustained load1–5Not documentedBelow 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[22]Moderate — no CF-grade S-N curve; unfilled printed PETG ran 79 000–193 000 cycles at 30 % of tensile strength[28]
Elasticity / flexibility1–5Semi-flexible[23]Rigid[3]
Z strength as % of XY%59 dry (45.8 Z against 78.0 XY) and 40 wet, printed[1]83 (Bambu Lab, printed Z against XY tensile)[3]
Thermal Properties
HDT at 0.45 MPa°C111 (ISO 75, 0.45 MPa, Polymaker CoPA)[1]74 (Bambu Lab) and 96 (Prusament), ISO 75 at 0.45 MPa[3][4]
HDT at 1.8 MPa°C70 (ISO 75, 1.8 MPa, Polymaker CoPA)[1]68 (Bambu Lab) and 80 (Prusament), ISO 75 at 1.8 MPa[3][4]
Glass transition (Tg)°C66 (DSC, Polymaker CoPA)[1]68 (Bambu Lab) and 80 (3DXTech), DSC[3][5]
Melting point / Vicat°C189 melting (DSC); Vicat 180, crystallisation 148, decomposition 370 (Polymaker CoPA)[1]225 melting (Bambu Lab, DSC) — the carbon fibre lets the PET fraction crystallise[3]
Continuous service temperature°CNot documented77 — loaded bars begin to move at this temperature, against 61 for Bambu Lab PETG Basic[19]
Annealing response80 °C for 6 h (Polymaker CoPA)[1]Not documented
Thermal expansion (CTE)µm/m·K81.0 on extruded unfilled PA66 stock (ASTM D696; source states 4.5e-5 in/in/°F) — the same chemistry as a PA6/66 copolymer[27]Not documented
Flammability / UL 94Not documentedFlammable; no UL 94 rating published[3]
Environment & Chemical
UV resistance1–5Not documentedModerate — a season or two; the carbon fibre does not add UV stabilisation[29]
Chemical resistanceNot documentedWithstands acids, alkalis, oils and UV exposure, as for unfilled PETG[29]
Water / humidity resistance in service1–5Absorbs water, properties shift — 6.16 % uptake cost 56 % of tensile strength and 73 % of modulus[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[30]Moderate — measurable VOCs and UFPs, ventilation advised[30]
VOC emission rateµg/minUp to 180 caprolactam, the dominant VOC from nylon; total VOC reached nearly 200 µg/min, the highest of the nine filaments tested[30]Not documented
Ultrafine-particle emission rateparticles/min≈2 × 10⁸ median — low for ultrafine particles despite the highest VOC mass of any filament tested[30]Not documented
Hazardous species emittedCaprolactam, at up to 180 µg/min from nylon filament — the largest single-VOC emission rate measured in the study[30]Not documented
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 pairingCoPA can support itself, but Polymaker warns the support bonds permanently if it absorbs moisture before removal[1]Support for PLA or its own material (Bambu Lab)[3]
Dimensional accuracy & detailNot documentedMatte finish hides layer lines; stringing is reduced against unfilled PETG[3]
Solvents & Solubility
Soluble inDissolved at 23 °C by formic acid above ~50 %, phenol, m-cresol, 96 % sulphuric acid or hexafluoroisopropanol — laboratory reagents.[31]No common workshop solvent; dichloromethane — a carcinogen — dissolves the matrix surface, 1,2-dichloroethane destroys it in a week.[32][33]
Softened or crazed byZinc chloride solutions stress-crack it — 10 % marginal, 37 % not resistant; alcoholic calcium chloride dissolves it.[31]Acetone (+16 % weight over 1 year at 23 °C), ethyl acetate, toluene and DMF swell and soften it; methanol crazes it.[32]
Solvent welding & smoothing agentNone — nylon's only solvents are formic acid, phenol and HFIP, all of which degrade the part they wet.[31]Dichloromethane reaches only the resin, so the fibre is left standing proud of the surface. Controlled carcinogen.[33]

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. PolyMide CoPA Technical Data Sheet V5.4 (dry and wet status blocks) Polymaker · 2024-11 · tds
  2. AmideX Nylon 6-66 — product page 3DXTech · 2026-08 · vendor
  3. Bambu Filament Technical Data Sheet — PETG-CF Bambu Lab · 2026-08 · tds
  4. Prusament PETG Carbon Fiber Technical Datasheet Prusa Polymers · 2026-08 · tds
  5. CarbonX Carbon Fiber PETG Technical Data Sheet 3DXTech · 2026-08 · tds
  6. Polymaker product catalogue Polymaker · 2026-08 · vendor
  7. add:north Adura product page add:north · 2026-08 · vendor
  8. PrimaCreator SELECT NylonPower PA6/66 product page PrimaCreator · 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. 3DXTech product catalogue 3DXTech · 2026-08 · vendor
  17. ELEGOO product catalogue ELEGOO · 2026-08 · vendor
  18. Max volumetric speed Prusa Knowledge Base · 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. Wet Filament — signs, causes and drying Polymaker Wiki · 2026-08 · doc
  22. PA (Nylon) — material basics Polymaker Wiki · 2026-08 · doc
  23. Moisture Conditioning — effect on printed nylon properties Polymaker Wiki · 2026-08 · doc
  24. CARBONX PETG+CF — product page (print recommendations) 3DXTech · 2026-08 · doc
  25. Composite materials filled with carbon, kevlar or glass Prusa Knowledge Base · 2026-08 · doc
  26. PolyMide CoPA — Technical Data Sheet page Polymaker Wiki · 2026-08 · tds
  27. TECAMID 66 natural (PA66) — stock shape properties Ensinger · 2026-08 · tds
  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. Ultramid Nylon Chemical Resistance guide (unmodified PA6 B27E and PA66 A27E) BASF · 2026-08 · tds
  32. Eastman Spectar copolyester — Chemical resistance (unstressed bars, 1 year at 23 °C) Eastman Chemical Company · 2026-08 · tds
  33. Improve your 3D prints with chemical smoothing Prusa Research · 2026-08 · doc