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PETG-CF
$26.95
1.75 mm diameter · 1 kg net filament per spool
PETG-CF combines PETG’s toughness with carbon fibre’s stiffness — the most practical all-round composite for brackets, mounts and mechanical parts that face real-world loads.
Printing & drying
- Material
- PETG composite
- Diameter
- 1.75 mm
- Spool
- 1 kg net
- Nozzle
- 240–270°C
- Bed
- 65–75°C
- Printing speed
- < 220 mm/s
- Part cooling
- Low to medium
- Enclosure
- Not required
- Nozzle type
- Hardened steel, 0.6 mm or larger
- Drying
- 60 ± 5°C for 8h
These are typical working ranges for orientation. The label on the spool you receive is authoritative for that batch. More detail in the storage and drying guide and the troubleshooting guide.
Shipping
- Packed and dispatched from Sydney, Australia.
- Every spool ships sealed with desiccant.
- Tracking is provided on every order.
- Buying more than a few spools? Bulk Orders gets you a quote and a supply plan.
Current delivery timeframes are on the Shipping & Returns page.
Returns & warranty
- Backed by the Australian Consumer Law.
- Spool faults are a product fault, not a settings problem. Contact us with your order number and photos.
- Not sure whether it is the spool or the printer? The five-minute triage tells you which half is at fault.
Full terms on the Shipping & Returns page.
Material details
PETG-CF is the composite that does not make you choose. Carbon fibre gives it a bending modulus of 3040 ± 21 MPa and a tensile strength of 51 ± 8 MPa — the highest of any material in the range — while the PETG underneath keeps an impact strength of 70.7 ± 6.2 kJ/m². Stiff and tough at once, with a heat deflection temperature of 74 °C, and it still prints without an enclosure.
What PETG-CF is good for
Most composites trade toughness for stiffness. PETG-CF is the exception in this range: its impact strength is higher than plain Ultra PETG’s, not lower, while the fibre loading nearly doubles PLA-CF’s resistance to being pulled apart. If you are printing a part that has to carry load, survive being knocked, and keep its shape in a warm shed, this is the one.
How PETG-CF prints
The manufacturer’s published window is a nozzle at 240–270 °C and a bed at 65–75 °C with adhesive, at speeds up to 220 mm/s. That is slower than unfilled Ultra PETG by design — fibre-filled melt does not flow as readily, and pushing the speed is how you get under-extrusion and weak layers on a part bought precisely for its strength.
A hardened steel nozzle is mandatory — carbon fibre wears brass out of round within a few spools. Keep part cooling low, as with any PETG, and put a glue-stick layer down first: PETG bonds hard enough to bare PEI or glass to take the surface with it. Drying matters more here than on most materials, for the reason below.
What PETG-CF will not do
Read this before you buy it for the wrong job
PETG-CF has no meaningful UV resistance. The carbon fibre does not change that — a part in direct Australian sun will chalk and embrittle over a season or two, same as plain PETG. For sun exposure, ASA is the material designed for it.
It is also the fussiest material here about moisture. PETG is hygroscopic to begin with, and the fibre gives water somewhere extra to sit; a damp spool prints a part that looks right and delaminates under the first real load. And the abrasive fibre makes a hardened nozzle a hard requirement, not a recommendation.
If any of those apply, the range goes elsewhere:
- ASA — direct sun & UV
- ABS-CF — stiff at 90 °C
- PETG-GF — glass instead of carbon
- Ultra PETG — tough, unfilled, faster
The Materials Guide compares the composites side by side with the published numbers.
Finish and colour
PETG-CF comes in one finish: a matte black with the fine granular surface the fibre gives it. Layer lines all but vanish, which is unusual for PETG — unfilled PETG is glossy and shows every line. A structural part in this material looks like a moulded component rather than a print.
1 colours in this material
Printer compatibility
PETG-CF is 1.75mm 3D printer filament on a standard 1 kg spool, so it fits any FDM printer that takes 1.75 mm and reaches 250 °C at the nozzle — with one hardware requirement: a hardened steel nozzle, 0.6 mm or larger. Many current machines ship with one already; older printers usually need a five-minute swap. The spool label states a diameter tolerance of ±0.02 mm, and the filament tip is secured before packing so the spool does not tangle mid-print.
- Bambu Lab
- Prusa
- Creality
- Elegoo
- Anycubic
- Sovol
- Hardened steel nozzle required
Storage, drying and shelf life
This is the material to take drying seriously on. PETG absorbs moisture readily, the carbon fibre gives it more surface to hold water against, and the failure mode is the worst kind: a part that prints looking perfectly acceptable and then delaminates along a layer line under load.
Every spool ships sealed with desiccant. Keep it that way between prints and it will not come up. If a spool has been open through a humid season — or if you hear hissing at the nozzle — the manufacturer’s figure is 60 ± 5 °C for 8 hours in a dryer or blast oven, with storage below 20% relative humidity. The storage and drying guide covers what that looks like in practice.
Technical specifications
Preparation Before Printing
- Drying settings (blast drying oven)
- 60 ± 5 °C for 8h
- Printing & storage humidity
- ≤ 20% RH (Sealed with Desiccant)
Recommended Printing Settings
- Nozzle temperature
- 240 - 270 °C
- Bed temperature (with glue)
- 65 - 75 °C
- Printing speed
- < 220 mm/s
Physical Properties
- Density
- 1.29 g/cm³
- Melt index
- 10.3 ± 3.2 g/10 min
- Melting temperature
- 226 °C
- Vicat softening temperature
- 83 °C
- Heat deflection temperature
- 74 °C
Mechanical Properties
- Tensile strength
- 51 ± 8 MPa
- Elongation at break
- 9.6% ± 1.0%
- Bending strength
- 75 ± 2 MPa
- Bending modulus
- 3040 ± 21 MPa
- Impact strength
- 70.7 ± 6.2 kJ/m²
Manufacturer figures for PETG-CF, from PETG / TPU / ABS / ASA Parameters. Test values are measured on standard samples and are for design comparison — real-world results depend on your printer, settings and model.
Common questions about PETG-CF
Is PETG-CF stronger than plain PETG?
On the published numbers, yes, in every dimension that matters. Tensile strength rises from 42 MPa to 51, bending modulus from 2097 MPa to 3040, heat deflection from 72 °C to 74, and even impact strength climbs slightly, from 67.6 to 70.7 kJ/m². The trade is print speed, a hardened nozzle, and a higher price.
Is carbon fibre filament worth it?
For structural parts, this one is. PETG-CF is the only material in the range that is simultaneously the stiffest, the strongest in tension and among the toughest — most composites buy stiffness by giving up impact resistance. If the part is decorative or lightly loaded, you are paying for properties you will not use.
Is PETG-CF stronger than PLA-CF?
Considerably. Tensile strength of 51 MPa against 39, impact strength of 70.7 kJ/m² against 24.7, and heat deflection of 74 °C against 56. PLA-CF is marginally stiffer in bending and much easier to print; PETG-CF is the one to use when the part has a job to do.
Do I need an enclosure?
No. PETG-CF warps less than plain PETG, which already warps very little, so an open printer is fine.
What nozzle size should I use?
0.6 mm or larger, in hardened steel. The wider orifice is not only about wear — a bundle of chopped fibre can bridge a 0.4 mm opening and stop a print halfway through.
How much can I print from a 1 kg spool?
At PETG-CF’s density of 1.29 g/cm³, a 1 kg spool of 1.75 mm filament holds roughly 320 metres. Structural parts usually want more walls and higher infill than decorative ones, so expect a spool to go less far than the same weight of PLA.
Can PETG-CF parts be used outdoors?
In the shade, yes — it handles moisture and warmth well. In direct sun, no. Neither PETG nor carbon fibre offers UV protection, so a sun-exposed part chalks and goes brittle. Core ASA is the material for that job.
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