ELEGOO PETG-CF vs Siraya Tech PETG-CF Pro HF

Who this comparison is for

This page is for anyone choosing between two specific spools: ELEGOO PETG-CF in Carbon Fiber Black (1 kg, SKU SPUS-EL-GCF-001) and Siraya Tech Fibreheart PETG-CF Pro HF in High Flow Black (1 kg, US SKU ST3031). Siraya Tech's data sheet gives the diameter as 1.75 ± 0.02 mm. ELEGOO's page text doesn't state a diameter, though its product address says 1.75 mm. Both makers pitch carbon fiber for stiffness and a matte finish. The real question is whether your nozzle, dryer, and printer setup meet each maker's conditions. If you haven't printed abrasive filament before, start with our abrasive filament nozzle guide. For more options, see the carbon fiber filament shortlist.

How we compared them

This is a research-based comparison. Every figure below comes from ELEGOO's product page, Siraya Tech's product page, data sheet page, and user guide, and Bambu Lab's AMS and filament documentation, all listed in the sources. We haven't tested either filament, so nothing here is a measured result of ours. Where a maker describes its own product, such as ELEGOO's "No Warping" or Siraya Tech's "2X Faster Printing," we label it as the maker's claim.

Print settings are each maker's guidance, so they sit together in the table below. Test figures are another matter. ELEGOO's specification table names no test method or specimen settings, and only its heat deflection row gives a load. Siraya Tech names ASTM and ISO methods, and its user guide describes its specimens. Because only one side states how its numbers were made, we list each maker's test figures on its own rather than set them head to head.

Side-by-side specs

The nozzle comes first

Carbon fiber wears brass nozzles, and both makers say so.

So both rule out brass and a 0.2 mm nozzle.

On a Bambu Lab printer, Bambu's filament guide says to always use a hardened steel nozzle for fiber-filled filament, never a 0.2 mm one, and names a 0.6 mm hardened steel nozzle as first choice for fiber filament other than its own specially designed grades. A 0.4 mm hardened nozzle is its second choice, at a maximum speed of about 100 mm/s. Our replacement nozzle guide covers choosing one.

Temperatures, speed, and flow

The two windows overlap almost entirely. ELEGOO lists 240–270 °C, and Siraya Tech's data sheet lists 250–270 °C. Siraya Tech's user guide adds detail: "Start at 255°C for standard speeds. Increase temperature for high-speed printing (>150mm/s) to ensure proper melting," with a detailed range of 250–280 °C that runs past its own data sheet. The beds differ by 5 °C at each end: 65–75 °C for ELEGOO and 70–80 °C for Siraya Tech.

Speed is where Siraya Tech leans in. It calls this a "High-Flow (HF) formula" that "enables speeds up to 25 mm³/s, cutting production time by half," and its data sheet says the filament is "Capable of 30 mm/s up to 300 mm/s." Its user guide's quick start gives 50–250 mm/s. ELEGOO gives one figure, below 220 mm/s. Neither maker names the nozzle size or layer height behind its figure, and Bambu's 100 mm/s figure for a 0.4 mm hardened nozzle is far lower than either. Treat any top speed as a ceiling, not a target. Our high-speed filament guide explains what flow figures mean.

On cooling, Siraya Tech's data sheet says "Off or run very low (10-20%)," and its user guide says to keep the fan "below 50%" because "Excessive cooling can reduce layer adhesion, making the part brittle." ELEGOO doesn't give a fan setting on its page.

Enclosure and bed

This is the clearest difference in printer setup.

On the bed, ELEGOO recommends glue on textured or smooth PEI and claims "Low Shrinkage & No Warping," which is the maker's claim. Siraya Tech's data sheet lists glass, PEI film, or PVP glue stick, and warns: "Avoid "squishing" the first layer too tightly, as this can cause nozzle clogs." Its troubleshooting fix for warping is to raise the bed to 80 °C and add a brim.

Our enclosure planning guide covers what an enclosure does and doesn't do.

Drying and moisture

Both makers treat moisture seriously, and ELEGOO's own page gives two drying temperatures.

• ELEGOO marks drying before use as "Required" in its specification table, at 60 ± 5 °C for 8 hours. A note near the price and another under "Compatibility" say "Dry at 60°C for 8 Hours before Use for Optimal Print Quality," but the "Important Notes" list says "Dry at 70 °C for 8 Hours before Use for Optimal Print Quality." ELEGOO also says to print and store at or below 20% RH, sealed with desiccant.
• Siraya Tech gives 70–80 °C for 4–6 hours in its data sheet. Its user guide calls the filament "hygroscopic (absorbs moisture)" and moisture "the #1 cause of printing issues like stringing and rough surfaces," and says "It is highly recommended to feed the filament directly from a dry box during the printing process."

Neither maker publishes a water absorption figure or a temperature rating for its spool. Check your dryer's top temperature, and whether the spool can take it, before you buy. Our filament dryer vs dry box guide covers the options.

Strength and heat figures: listed separately

ELEGOO's specification table gives figures labelled X-Y and Z, but names no test method, specimen type, or print settings, and only its heat deflection row names a load. Siraya Tech's data sheet uses ASTM D638 for tensile figures, ISO 178 for bending, ISO 179 for Charpy impact, ISO 306 for Vicat, and names its heat deflection methods only as "Method A" and "Method B," though its user guide lists the 0.45 MPa figure under "ISO 75 Method B." The guide says its data is "based on printed specimens (0.4mm nozzle, 100% infill, ±45° angle)." Neither maker mentions annealing. With only one side describing its method, we don't set these numbers against each other.

ELEGOO PETG-CF (product page specification table, no methods named)

• Heat deflection temperature: 74 °C at 0.45 MPa; no 1.8 MPa figure
• Vicat softening temperature: 83 °C
• Melting temperature: 226 °C
• Tensile strength: 51 ± 8 MPa X-Y, 38 ± 5 MPa Z
• Elongation at break: 9.6% ± 1.0% X-Y, 7.5% ± 1.0% Z
• Bending strength: 75 ± 2 MPa X-Y, 53 ± 4 MPa Z
• Bending modulus: 3040 ± 21 MPa X-Y, 2222 ± 33 MPa Z
• Impact strength: 70.7 ± 6.2 kJ/m² X-Y, 14.6 ± 2.1 kJ/m² Z, test type not stated
• Density: 1.29 g/cm³; melt index 10.3 ± 3.2 g/10 min

Siraya Tech Fibreheart PETG-CF Pro HF (TDS page)

• Heat deflection temperature: 69 °C at 1.80 MPa ("Method A"); 75 °C at 0.45 MPa ("Method B")
• Vicat softening temperature: 85 °C (ISO 306)
• Glass transition: 68 °C; melting point: 220 °C (ASTM D3418)
• Tensile stress at break: 44 MPa X-Y (ASTM D638)
• Young's modulus: 3400 MPa X-Y (ASTM D638)
• Elongation at break: 7.5% X-Y (ASTM D638)
• Bending strength: 85 MPa; bending modulus 3450 MPa (ISO 178; direction not stated on the TDS)
• Charpy impact: 4.5 kJ/m² (ISO 179; notch and direction not stated)
• Notched Izod impact at 72 °F: 15 J/m (ASTM D256)
• Density: 1.3 g/cm³ (ISO 1183)

Siraya Tech's product page headline gives a "76°C HDT" without a load, one degree above the data sheet's 0.45 MPa figure. Whatever the method, both makers' heat figures sit in the 70s °C at 0.45 MPa, so check them against the temperatures your part will see. ELEGOO's Z figures, between layers, are lower than its X-Y figures, so orient parts so the main load runs along the layers. Siraya Tech doesn't publish Z figures.

Bambu's AMS and third-party PETG-CF

If you own a Bambu Lab printer with an AMS, read this before you load either spool.

• Siraya Tech answers "Is it AMS compatible?" with "Yes, it is rigid enough for smooth loading in systems like the AMS."
• ELEGOO makes no AMS statement for the filament. It offers a printable "Filament Ring" that it says helps the spool "adapt to AMS (because AMS will rub the bottom paper tray, causing the paper tray to easily delaminate)," and suggests printing the ring in PETG. That's about the spool, not the filament.

Bambu's own documents point two ways. Its filament guide table lists PETG-CF as "AMS: Compatible" and "AMS lite: Not Recommended," but its table notes say that rating covers loading and unloading only, and that you "should also check whether the roughness of the filament may wear down the internal feed channel." The same guide warns that carbon fiber "can eventually grind down the internal PTFE feed channels." Bambu's Notes for AMS go further, advising against "third-party fiber reinforcement materials (PA-CF/GF, PET-CF/GF, PLA-CF /GF, etc.)" because they "may wear AMS PTFE tubes," while its own "PLA-CF, PETG-CF, PAHT-CF and other official filaments are specially optimized." Neither filament here is Bambu's. Siraya Tech's statement is the filament maker's claim, and Bambu's notes are the printer maker's advice, so weigh both, and use the external spool holder if you want to avoid wear on the AMS feed path. Our AMS filament compatibility guide covers Bambu's rules and the external spool route.

What each maker says it's for

• ELEGOO PETG-CF. ELEGOO pitches it for "robust industrial jigs, lightweight brackets, durable bike components and drone parts," and for "gears, bearings, and structural parts." It says "Compared to PLA-CF, Elegoo PETG-CF provides superior toughness and is less prone to fracture under external stress and impact," and that carbon fiber gives "a distinct, fine matte texture that reduces visible layer lines." It also says it is "Compatible with most FDM 3D printers on the market."
• Siraya Tech Fibreheart PETG-CF Pro HF. Siraya Tech pitches it for "jigs, fixtures, drone parts, and high-performance prototyping." It says "Unlike carbon fiber powder PETG-CF, we use short chopped carbon fibers," claims "Significantly higher impact resistance and HDT (76°C)" with "minimal warping," and its FAQ says that, compared with standard PETG-CF, "The Pro version is tougher, more heat-resistant, and prints significantly faster."

Those are each maker's claims, without a published test against the other filament.

ELEGOO

ELEGOO PETG-CF (Carbon Fiber Black, 1.75 mm, 1 kg)

Best for

Stiff matte functional parts on a printer with a 0.4 mm or larger hardened steel nozzle.

Skip this if

Your printer only has a brass nozzle, or the part will see temperatures near the listed 74 °C (0.45 MPa) heat deflection temperature.

Specs, strengths, and limitations

Material

PETG (carbon-fiber filled)

Diameter

1.75 mm

Net filament

1000 g (filament only, not packaged weight)

Format

other

Maker's nozzle range

240–270 °C

Nozzle

Abrasive: the maker recommends a wear-resistant nozzle

Strengths

• Manufacturer states carbon fiber adds strength and rigidity, with abrasion resistance and dimensional stability.
• Manufacturer states that, compared with PLA-CF, it has superior toughness and is less prone to fracture under stress and impact.
• Manufacturer states a premium matte finish that reduces visible layer lines.

Limitations

• Abrasive: ELEGOO recommends a 0.4/0.6/0.8 mm hardened steel nozzle and says 0.2 mm nozzles are not compatible.
• Needs drying before use (60 ± 5 °C for 8 h per the spec table; the page's 'Important Notes' say 70 °C) and storage at ≤ 20% RH.
• Modest heat resistance: the spec table lists a heat deflection temperature of 74 °C at 0.45 MPa; no 1.8 MPa figure or TDS PDF is published.

View on Amazon ↗ (opens Amazon in a new tab)Details checked 2026-10-06 against the manufacturer. Price and availability are on Amazon.

Siraya Tech

Siraya Tech Fibreheart PETG-CF Pro HF (High Flow Black, 1.75 mm, 1 kg)

Best for

Fast, matte carbon-fiber PETG parts such as drone frames and fixtures on high-flow printers with a hardened nozzle.

Skip this if

Your printer has a brass nozzle, or the part must survive temperatures above about 70 °C.

Specs, strengths, and limitations

Material

PETG (high-flow, 10% short-cut carbon-fiber reinforced)

Diameter

1.75 mm

Net filament

1000 g (filament only, not packaged weight)

Format

other

Maker's nozzle range

250–270 °C

Nozzle

Abrasive: the maker recommends a wear-resistant nozzle

Strengths

• Manufacturer states a high-flow formula good for up to 25 mm³/s, which it says cuts production time by half.
• Manufacturer states chopped (not powdered) carbon fiber for stiffness; TDS lists a 3450 MPa bending modulus.
• Product page FAQ says it is rigid enough to load smoothly in AMS-type systems.

Limitations

• Abrasive: Siraya Tech requires a hardened steel or ruby nozzle of 0.4 mm or larger.
• Modest heat resistance: TDS heat deflection temperature is 69 °C at 1.8 MPa.
• Siraya Tech recommends an enclosure: the TDS says 'Not mandatory, but it is recommended', and the product page FAQ calls one 'highly recommended'.

View on Amazon ↗ (opens Amazon in a new tab)Details checked 2026-10-07 against the manufacturer. Price and availability are on Amazon.

Verdict: which should you buy?

Choose ELEGOO PETG-CF if…

• Your hardened steel nozzle (0.4, 0.6, or 0.8 mm) runs at 240–270 °C, and your bed reaches 65–75 °C.
• You print on an open-frame printer and want a maker that says enclosed printing isn't required.
• You already dry and store filament sealed, since ELEGOO lists drying as required and storage at or below 20% RH.
• You print at moderate speeds, below ELEGOO's 220 mm/s figure.

Choose Siraya Tech Fibreheart PETG-CF Pro HF if…

• Your hardened steel or ruby nozzle (0.4 mm or larger) runs at 250–270 °C, or up to 280 °C for fast printing, on a 70–80 °C bed.
• You print fast on a high-flow setup and want a maker that publishes a flow figure, up to 25 mm³/s.
• You have an enclosure, or can keep drafts and cold air away from large parts, as Siraya Tech recommends.
• You want a maker that states the fiber content (10%) and publishes named test methods.

Safety and limits

How this page was checked

Every temperature, speed, drying setting, spool detail, nozzle requirement, AMS statement, and test figure above comes from the manufacturer documents in the sources section, retrieved on 2026-10-13. We haven't printed with either filament for this page, so nothing here is a measured result of ours. ELEGOO's specifications are on its product page rather than in a separate data sheet, and a search of ELEGOO's US store found no data sheet for PETG-CF. ELEGOO's page gives 60 °C for drying in three places and 70 °C in its "Important Notes." Replies in the product page's Q&A section are labelled "Customer" rather than ELEGOO, so we didn't use them. Siraya Tech's product page prints the diameter as "1.75±0.2 mm," while its data sheet says 1.75 ± 0.02 mm. We use the data sheet. Its user guide gives a 250–280 °C nozzle range in one section and 250–270 °C in another, a fan setting that differs from the data sheet's, and calls the 44 MPa figure "Tensile Yield Strength" where the data sheet says "Tensile Stress at Break." Values vary by color and revision, so check the current documents for your spool. Read more in our editorial standards and affiliate disclosure.

Specialty materials: what to check before you buy a spool ↗