PETG with chopped carbon fibre: stiffness and heat deflection rise — Prusament reaches 96 °C at 0.45 MPa — while impact resistance and layer adhesion fall and a hardened nozzle becomes…
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Stiff functional parts and fixtures where PETG's toughness is traded for rigidity and a matte finish
PETG with chopped carbon fibre: stiffness and heat deflection rise — Prusament reaches 96 °C at 0.45 MPa — while impact resistance and layer adhesion fall and a hardened nozzle becomes mandatory.
PETG-CF is chosen when a fixture, mounting part or housing benefits more from rigidity and dimensional stability than from the flexibility of plain PETG. Prusa describes improved stiffness, thermal resistance and printing stability for its carbon-filled grade, along with reduced stringing and a matte surface. These are useful advantages for locating geometry and visible mechanical components.
The reinforcement does not improve every property: Prusa explicitly reports lower toughness, and published tests show reduced layer performance in some grades. Small highly strained clips, impact-loaded features and sustained precision loads therefore need more care than the carbon-fibre name suggests. The filament is abrasive, and ordinary PETG-CF is not automatically static-dissipative.
A printed replacement ring-gear locking part, shown beside the worn original. The uploader reports Prusament PETG-CF and notes that long-term durability was not established.
Listing note: “Filament: Prusament PETG-CF”
Printables listing uploaded by thunderstorm-euphoria · CC BY 4.0Original listing · Checked 2026-10-17. This is an uploader report, not an independent material test.Source image · Image bytes unchanged; displayed in full.
Representative catalog values. Check the exact grade and its linked conditions before using a setting.
240–270 (Bambu Lab); 265 ± 10 (Prusament)
240–270 (Bambu Lab); 265 ± 10 (Prusament)
65–75 (Bambu Lab); 90 ± 10 (Prusament)
65–75 (Bambu Lab); 90 ± 10 (Prusament)
Open frame fine; draught shield helps
Open frame fine; draught shield helps — Bambu Lab specifies a 35–50 °C chamber
65 °C for 8 h (Bambu Lab)
65 °C for 8 h (Bambu Lab)
Open a topic to explore the complete data. Each value keeps its original conditions, units and dated sources.
| Property and unit | Published value and conditions | Sources and dates |
|---|---|---|
| Base polymer / chemistry | PETG reinforced with chopped carbon fibre | 2 sources
|
| Density (g/cm³) | 1.25 (Bambu Lab) to 1.34 (3DXTech), ISO 1183; Prusament 1.27 | 3 sources
|
| Typical price (USD/kg) | 1 kg-equivalent spools span 16–74; the middle of the market is about 29 | 8 sources
|
| Price range across brands (USD/kg) | 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 | 10 sources
|
| Market availability (1–5) | Stocked by most mainstream brands | 4 sources
|
| Spool sizes & diameters | 1.75 and 2.85 mm; 0.75 and 1 kg spools | 2 sources
|
| Typical applications | Stiff functional parts and fixtures where PETG's toughness is traded for rigidity and a matte finish | 2 sources
|
| Diameter tolerance (± mm) | ±0.02 (Prusament) | 1 source
|
| Property and unit | Published value and conditions | Sources and dates |
|---|---|---|
| Nozzle temperature (°C) | 240–270 (Bambu Lab); 265 ± 10 (Prusament) | 2 sources
|
| Bed temperature (°C) | 65–75 (Bambu Lab); 90 ± 10 (Prusament) | 2 sources
|
| Enclosure / chamber requirement (1–5) | Open frame fine; draught shield helps — Bambu Lab specifies a 35–50 °C chamber | 1 source
|
| Recommended chamber temperature (°C) | 35–50 (Bambu Lab) | 1 source
|
| Part cooling fan | 0–60 % (Bambu Lab); 50 % (Prusament) | 2 sources
|
| Bed surface & adhesion aid | Textured PEI or engineering plate with glue (Bambu Lab) | 1 source
|
| Maximum volumetric flow (mm³/s; see test conditions) (mm³/s) | 11.5 on My Tech Fun's Bambu Lab PETG-CF profile | 1 source
|
| Bed-adhesion difficulty (1–5) | Needs the right surface or a thin adhesive | 1 source
|
| Stringing / oozing tendency (1–5) | Slight — the fibre reduces stringing against unfilled PETG | 2 sources
|
| Overall printing difficulty (1–5) | Intermediate — dry filament and a tuned profile; hardened nozzle mandatory | 1 source
|
| Property and unit | Published value and conditions | Sources and dates |
|---|---|---|
| Nozzle hardness required (1–4) | Hardened steel required | 1 source
|
| Abrasiveness (1–5) | Highly abrasive — standard CF composite | 1 source
|
| Nozzle clog risk (1–5) | 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 | 2 sources
|
| Heat-creep / jam sensitivity (1–5) | Slightly sensitive | 1 source
|
| Hotend requirement | Hardened steel nozzle; no high-temperature hot-end needed | 2 sources
|
| Property and unit | Published value and conditions | Sources and dates |
|---|---|---|
| Moisture absorption (hygroscopicity) (1–5) | Low — 0.30 % saturated at 25 °C / 55 % RH (Bambu Lab) | 1 source
|
| Equilibrium moisture content at ~50 % RH (%) | 0.30 saturated at 25 °C / 55 % RH (Bambu Lab); Prusa measures 0.10 after 7 days at 22 % RH | 2 sources
|
| Drying temperature & time | 65 °C for 8 h (Bambu Lab) | 1 source
|
| Symptoms when wet | Bubbling and popping at the nozzle, stringing and a rough surface | 1 source
|
| Effect of moisture on strength | No dry-versus-conditioned figures published; Bambu Lab states PETG-CF must be properly dried before printing and stored dry after use | 2 sources
|
| Storage requirement | Sealed with desiccant; Bambu Lab says store dry after use | 2 sources
|
| Property and unit | Published value and conditions | Sources and dates |
|---|---|---|
| Tensile strength (XY) (MPa) | 35 ± 5 (Bambu Lab) and 47 ± 2 at yield (Prusament) printed XY, ISO 527; 56 at break for 3DXTech | 3 sources
|
| Young's modulus (MPa) | 2460 ± 230 (Bambu Lab) and 1700 (Prusament) printed XY, ISO 527 | 2 sources
|
| Elongation at break (%) | 4.3 at yield (Prusament, printed XY, ISO 527); 3 at break for 3DXTech | 2 sources
|
| Flexural strength (MPa) | 68 ± 3 printed horizontal, ISO 178 (Prusament) | 1 source
|
| Flexural modulus (MPa) | 2300 printed horizontal, 3100 printed vertical, ISO 178 (Prusament) | 1 source
|
| Other impact data | 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 | 2 sources
|
| Layer adhesion / Z tensile (MPa) | 29 ± 4 printed Z (Bambu Lab, ISO 527); 18 ± 3 by Prusa's interlayer adhesion test; 10.7 on My Tech Fun bars | 3 sources
|
| Brittleness (1–5) | Brittle — snaps with little warning | 1 source
|
| Hardness (scale-specific) (Shore A / Shore D / Rockwell) | 77 Shore D (Prusa Polymers method) | 1 source
|
| Creep resistance / sustained load (1–5) | 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 | 1 source
|
| Fatigue / repeated-flex resistance (1–5) | Moderate — no CF-grade S-N curve; unfilled printed PETG ran 79 000–193 000 cycles at 30 % of tensile strength | |
| Elasticity / flexibility (1–5) | Rigid | 1 source
|
| Z strength as % of XY (%) | 83 (Bambu Lab, printed Z against XY tensile) | 1 source
|
| Property and unit | Published value and conditions | Sources and dates |
|---|---|---|
| HDT at 0.45 MPa (°C) | 74 (Bambu Lab) and 96 (Prusament), ISO 75 at 0.45 MPa | 2 sources
|
| HDT at 1.8 MPa (°C) | 68 (Bambu Lab) and 80 (Prusament), ISO 75 at 1.8 MPa | 2 sources
|
| Glass transition (Tg) (°C) | 68 (Bambu Lab) and 80 (3DXTech), DSC | 2 sources
|
| Melting point / Vicat (°C) | 225 melting (Bambu Lab, DSC) — the carbon fibre lets the PET fraction crystallise | 1 source
|
| Continuous service temperature (°C) | 77 — loaded bars begin to move at this temperature, against 61 for Bambu Lab PETG Basic | 1 source
|
| Flammability / UL 94 | Flammable; no UL 94 rating published | 1 source
|
| Property and unit | Published value and conditions | Sources and dates |
|---|---|---|
| UV resistance (1–5) | Moderate — a season or two; the carbon fibre does not add UV stabilisation | 1 source
|
| Chemical resistance | Withstands acids, alkalis, oils and UV exposure, as for unfilled PETG | 1 source
|
| Food contact | Not certified for food contact | 1 source
|
| Biodegradability / compostability | Not biodegradable | 1 source
|
| Recyclability | Fibre-filled PETG is not accepted in household plastic collection | 1 source
|
| Electrical & ESD properties | Surface resistance above 10⁹ ohm/sq — carbon fibre at this loading is not static-dissipative (3DXTech) | 1 source
|
| Property and unit | Published value and conditions | Sources and dates |
|---|---|---|
| Fume toxicity (1–5) | Moderate — measurable VOCs and UFPs, ventilation advised | |
| Ventilation / filtration requirement (1–5) | Open a window / occasional ventilation | |
| Dust & fibre handling hazard | Carbon fibre is bound in the matrix; sanding dust should not be inhaled | 1 source
|
| Property and unit | Published value and conditions | Sources and dates |
|---|---|---|
| Sanding & machining | Sands to a matte finish more readily than unfilled PETG | 1 source
|
| Gluing & solvent welding | Cyanoacrylate; no common solvent welds it | 1 source
|
| Vapour / chemical smoothing | No practical vapour smoothing | 1 source
|
| Support material pairing | Support for PLA or its own material (Bambu Lab) | 1 source
|
| Dimensional accuracy & detail | Matte finish hides layer lines; stringing is reduced against unfilled PETG | 1 source
|
| Property and unit | Published value and conditions | Sources and dates |
|---|---|---|
| Soluble in | No common workshop solvent; dichloromethane — a carcinogen — dissolves the matrix surface, 1,2-dichloroethane destroys it in a week. | 2 sources |
| Softened or crazed by | Acetone (+16 % weight over 1 year at 23 °C), ethyl acetate, toluene and DMF swell and soften it; methanol crazes it. | 1 source |
| Solvent welding & smoothing agent | Dichloromethane reaches only the resin, so the fibre is left standing proud of the surface. Controlled carcinogen. | 1 source
|
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.
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.
$79.99 / 5 kg = $16.00/kg, us.elegoo.com product catalogue, Aug 2026
Handle petg-cf-filament-1-75-mm-colored-5-kg. ELEGOO publishes printed X-Y and Z strength figures without naming a test standard, so they are recorded here rather than as specs: tensile 51 ± 8 MPa XY / 38 ± 5 MPa Z, bending 75 ± 2 MPa XY, impact 70.7 ± 6.2 kJ/m² XY.
Open product listing ↗| Density (g/cm³) | 1.29 (ELEGOO published spec table) |
|
|---|---|---|
| Nozzle temperature (°C) | 240–270 |
|
| Bed temperature (°C) | 65–75 |
|
| Recommended chamber temperature (°C) | 25–50 |
|
| Nozzle hardness required (1–4) | Hardened steel required, 0.4 mm or larger |
|
| Drying temperature & time | 60 ± 5 °C for 8 h; drying required |
|
| Elongation at break (%) | 9.6 ± 1.0 (printed XY); 7.5 printed Z |
|
| HDT at 0.45 MPa (°C) | 74 (0.45 MPa) |
|
| Melting point / Vicat (°C) | 226 melting; Vicat 83 |
|
$16.99 / 1 kg spool, Amazon US listing, Aug 2026 (list $29.99)
Amazon-only brand; reli3d.com does not resolve. Hardened or wear-resistant nozzle specified.
Open product listing ↗| Diameter tolerance (± mm) | +/-0.03 |
|
|---|
$19.99 / 1 kg spool, store.sunlu.com, Aug 2026 (list $22.99)
10 % carbon fibre. Vendor quotes 19 kJ/m² impact strength without naming a standard, so it is not recorded.
Open product listing ↗| Diameter tolerance (± mm) | +/-0.03 |
|
|---|---|---|
| Nozzle temperature (°C) | 240-250 |
|
| Bed temperature (°C) | 70-80 |
|
| HDT at 0.45 MPa (°C) | 70 (vendor heat distortion temperature, standard not stated) |
|
$22.00 / 1 kg spool, store.iemai3d.com, Aug 2026 (regular price $25.00)
Hardened steel nozzle required.
Open product listing ↗| Density (g/cm³) | 1.25 (ISO 1183) |
|
|---|---|---|
| Nozzle temperature (°C) | 230-250 |
|
| Tensile strength (XY) (MPa) | 35 +/- 5 (printed XY, ISO 527) |
|
| Young's modulus (MPa) | 2460 +/- 230 (printed XY, ISO 527) |
|
| Elongation at break (%) | 10.4 +/- 0.6 (printed XY, ISO 527) |
|
| Charpy impact, notched (kJ/m²) | 15.7 +/- 1.6 (printed XY, ISO 179, notched) |
|
| Layer adhesion / Z tensile (MPa) | 29 +/- 4 (printed Z, ISO 527) |
|
| HDT at 0.45 MPa (°C) | 74 (ISO 75, 0.45 MPa) |
|
| HDT at 1.8 MPa (°C) | 68 (ISO 75, 1.8 MPa) |
|
| Glass transition (Tg) (°C) | 68 (DSC) |
|
$25.49 / 1 kg spool, siraya.tech US store, Aug 2026 (list $29.99)
High-flow grade with chopped rather than powdered fibre; hardened steel nozzle required.
Open product listing ↗| Density (g/cm³) | 1.3 (ISO 1183) |
|
|---|---|---|
| Nozzle temperature (°C) | 250-270 |
|
| Bed temperature (°C) | 70-80 |
|
| Maximum volumetric flow (mm³/s; see test conditions) (mm³/s) | 25 (vendor maximum) |
|
| Tensile strength (XY) (MPa) | 44 (printed XY, ASTM D638) |
|
| Young's modulus (MPa) | 3400 (printed XY, ASTM D638) |
|
| Elongation at break (%) | 7.5 (printed XY, ASTM D638) |
|
| Charpy impact, notched (kJ/m²) | 4.5 (printed, ISO 179) |
|
| HDT at 0.45 MPa (°C) | 75 (ISO 75 method B, 0.45 MPa) |
|
| HDT at 1.8 MPa (°C) | 69 (ISO 75 method A, 1.8 MPa) |
|
| Glass transition (Tg) (°C) | 68 (ASTM D3418) |
|
$31.99 / 1 kg spool, us.store.bambulab.com, Aug 2026
Melting temperature 225 °C and HDT 74 °C at 0.45 MPa. Hardened nozzle required.
Open product listing ↗| Density (g/cm³) | 1.25 (ISO 1183) |
|
|---|---|---|
| Tensile strength (XY) (MPa) | 35 ± 5 (printed XY, ISO 527) |
|
| Layer adhesion / Z tensile (MPa) | 29 ± 4 (printed Z, ISO 527) |
|
| HDT at 0.45 MPa (°C) | 74 (ISO 75, 0.45 MPa) |
|
EUR 49.07 incl. tax / 1 kg spool = $53.00/kg at 1.08 USD/EUR, sakata3d.com, Aug 2026
15 % carbon fibre, heat stabilised; maker specifies a hardened-steel nozzle. Figures are injection-moulded bars.
Open product listing ↗| Density (g/cm³) | 1.40 (ISO 1183) |
|
|---|---|---|
| Diameter tolerance (± mm) | 0.03 |
|
| Nozzle temperature (°C) | 235–255 classic, 245–265 high-speed |
|
| Bed temperature (°C) | 60–70 |
|
| Maximum volumetric flow (mm³/s; see test conditions) (mm³/s) | 16 (0.4 mm nozzle) |
|
| Tensile strength (XY) (MPa) | 90 (injection-moulded, ISO 527) |
|
| Young's modulus (MPa) | 6500 (injection-moulded, ISO 527) |
|
| Elongation at break (%) | 3 (injection-moulded, ISO 527) |
|
| Flexural strength (MPa) | 115 (injection-moulded, ISO 178) |
|
| Flexural modulus (MPa) | 6200 (injection-moulded, ISO 178) |
|
| Charpy impact, notched (kJ/m²) | 5 (injection-moulded, ISO 179 notched) |
|
| Other impact data | 55 kJ/m² unnotched Charpy, ISO 179 (injection-moulded) |
|
| HDT at 0.45 MPa (°C) | 70 (injection-moulded, ISO 75) |
|
| HDT at 1.8 MPa (°C) | 60 (injection-moulded, ISO 75) |
|
$50.00 / 750 g spool = $66.67/kg, 3dxtech.com product catalogue, Aug 2026
Handle carbonx-petg-cf-1. Density 1.34 g/cm³, Tg 80 °C.
Open product listing ↗| Density (g/cm³) | 1.34 (ISO 1183) |
|
|---|---|---|
| Nozzle temperature (°C) | 245 (TDS printed-specimen condition) |
|
| Bed temperature (°C) | 60 (TDS printed-specimen condition) |
|
| Tensile strength (XY) (MPa) | 56 at break (ISO 527) |
|
| Young's modulus (MPa) | 5230 (printed XY, ISO 527) |
|
| Elongation at break (%) | 3 at break (printed XY, ISO 527) |
|
| Flexural strength (MPa) | 80 (printed XY, ISO 178) |
|
| Flexural modulus (MPa) | 5740 (printed XY, ISO 178) |
|
| HDT at 0.45 MPa (°C) | 77 (ISO 75, 0.45 MPa) |
|
| Glass transition (Tg) (°C) | 80 (DSC) |
|
| Electrical & ESD properties | Surface resistance >10^9 Ω/sq (ASTM D257) |
|
$69.99 / 1 kg spool with NFC, printedsolid.com product catalogue, Aug 2026
Handle prusament-petg-carbon-fiber-black-1kg-nfc. HDT 96 °C at 0.45 MPa, the highest of the PETG-CF grades here.
Open product listing ↗| Density (g/cm³) | 1.27 (ISO 1183) | |
|---|---|---|
| Diameter tolerance (± mm) | ±0.02 |
|
| Nozzle temperature (°C) | 265 ± 10 | |
| Bed temperature (°C) | 90 ± 10 | |
| Equilibrium moisture content at ~50 % RH (%) | 0.1 after 7 days at 24 °C / 22 % RH | |
| Tensile strength (XY) (MPa) | 47 ± 2 at yield (printed horizontal, ISO 527-1); vertical xz 52 | |
| Young's modulus (MPa) | 1700 ± 100 (printed horizontal, ISO 527-1); vertical xz 1800 | |
| Elongation at break (%) | 4.3 ± 0.1 at yield (printed horizontal, ISO 527-1) | |
| Flexural strength (MPa) | 68 ± 3 (printed horizontal, ISO 178); vertical xz 80 | |
| Flexural modulus (MPa) | 2300 ± 100 (printed horizontal, ISO 178); vertical xz 3100 | |
| Other impact data | Charpy unnotched 29 kJ/m² horizontal, 43 kJ/m² vertical xz (ISO 179-1) | |
| Layer adhesion / Z tensile (MPa) | 18 ± 3 (Prusa Polymers interlayer adhesion test) |
|
| Hardness (scale-specific) (Shore A / Shore D / Rockwell) | 77 Shore D (Prusa Polymers method) | |
| Z strength as % of XY (%) | 38 (interlayer adhesion 18 vs printed horizontal tensile 47) | |
| HDT at 0.45 MPa (°C) | 96 (ISO 75, 0.45 MPa) |
|
| HDT at 1.8 MPa (°C) | 80 (ISO 75, 1.8 MPa) |
EUR 34.36 incl. 21 % VAT / 0.5 kg spool = EUR 68.72/kg = $74.22/kg at 1.08 USD/EUR, shop.filament-pm.com, Aug 2026
17 % carbon fibre, 0.15 mm fibre length. Maker specifies a 0.4 mm nozzle or larger. Sold only in 0.5 kg spools.
Open product listing ↗| Density (g/cm³) | 1.27 (ISO 1183/B) |
|
|---|---|---|
| Diameter tolerance (± mm) | 0.05 |
|
| Nozzle temperature (°C) | 220–250 |
|
| Bed temperature (°C) | 80–90 |
|
| Flexural modulus (MPa) | 2500 (ISO 178) |
|
| Other impact data | 23 kJ/m² impact strength, ISO 179 (notch type and specimen not stated) |
|
| HDT at 0.45 MPa (°C) | 70 (ISO 75, load not stated) |
|
| Melting point / Vicat (°C) | 85 (Vicat, ISO 306) |
|
Listed $29.99/1 kg; regular price unknown. Micro Center (Tustin, CA), 2026-10-17; excludes tax/shipping.
Carbon-fiber-filled PETG according to retailer designation. No fiber fraction or measured strength is inferred.
Open product listing ↗| Spool sizes & diameters | 1 kg spool; 1.75 mm diameter (retailer listing) |
|---|
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