Polymaker Fiberon PA6-CF20 vs ELEGOO PAHT-CF

Who this comparison is for

This page is for anyone choosing between these two specific spools: Polymaker Fiberon PA6-CF20 in Black (1.75 mm, 1 kg, SKU FG03003) and ELEGOO PAHT-CF in Carbon Fiber Black (1 kg, SKU SPUS-EL-TCF-001). ELEGOO's page text doesn't state a diameter, though its product address says 1.75 mm. These are engineering filaments, a step up from PLA-CF in heat, drying, and printer demands, so the real question is whether your printer and dryer can 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. For a PA12-based carbon-fiber nylon from Polymaker, see Fiberon PA12-CF10 vs SUNLU PA12-CF.

How we compared them

This is a research-based comparison. Every figure below comes from Polymaker's product page and data sheet, ELEGOO's product page, and Bambu Lab's AMS and filament documentation, 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 "Withstands temperatures up to 215°C" or "No warping," we label it as the maker's claim.

We only put numbers side by side where both makers publish the same kind of value. Print settings are each maker's guidance, so they sit together below. ELEGOO doesn't name a test method or specimen settings for its strength and heat figures, and we found no ELEGOO data sheet for this filament, so we list test figures separately rather than set them head to head.

Side-by-side specs

The nozzle and hotend come first

Carbon fiber wears brass nozzles quickly, and both makers say so. Polymaker's data sheet says "Abrasion of the brass nozzle happens frequently" with this filament, that "the life of a brass nozzle would be approximately 9h," and that a "wear-resistance nozzle, such as hardened steel and ruby nozzle, is highly recommended." Its product page lists the printing requirements as an "All-metal hotend 280˚C+," a hardened nozzle, a filament dryer, annealing after printing, and moisture conditioning after annealing. ELEGOO's notes say "0.2 mm Nozzle Not Compatible" and "0.4 mm/0.6 mm/0.8 mm Hardened Steel Nozzle Recommended."

Hotend temperature is the practical split. Polymaker's window, 280–300 °C, sits above ELEGOO's 260–290 °C, and the two overlap only at 280–290 °C. If your hotend tops out below 280 °C, Polymaker's own requirement rules its filament out.

On a Bambu Lab printer, Bambu's filament guide marks a hardened steel nozzle as "Required" for PA-CF, PA6-CF, and PAHT-CF, rules out the 0.2 mm nozzle, and names a 0.6 mm hardened steel nozzle as first choice for third-party fiber filament, with a 0.4 mm as second choice at a maximum speed of about 100 mm/s. Our replacement nozzle guide covers choosing one.

Heat, enclosure, and bed: two different approaches

This is the biggest difference between the two, and it shapes which printer each suits.

Polymaker keeps things cool. Its data sheet gives a 40–50 °C bed, a room-temperature chamber, and the cooling fan off. Its FAQ explains why: its nylons use "Warp-Free™ Technology," and for that to work, "we want to make sure the build plate and the ambient air temperatures are both below 50˚C," with annealing afterwards to reach full strength. Its printing tips add that "an actively heated chamber is not required." The page's specification panel still says "Enclosure Recommended," so a closed printer that stays below 50 °C inside fits both statements.

ELEGOO runs hot. Its specification table lists enclosed printing as "Required," a 45–60 °C chamber, a 90–110 °C bed, and glue as "Required" on textured or smooth PEI. Its notes repeat "Enclosure Printer Required." The page also says the filament is "Compatible with most FDM 3D printers on the market" and, further down, "Fit Most Enclosed 3D Printers." Read the enclosure requirement as the rule, and check that your bed reaches 110 °C. Our enclosure planning guide covers what an enclosure does and doesn't do.

Bambu's own filament guide lists PA, PA6-CF, and PAHT-CF among materials that "Require higher heatbed and chamber temperatures" and recommends an enclosed printer for them. That's Bambu's general guidance for its printers. Polymaker's warp-free approach is the filament maker's specific advice for Fiberon PA6-CF20, so start from the filament maker's settings.

Speed

Polymaker's data sheet and print settings say "up to 300mm/s," but the specification panel on the same page gives a maximum of 60 mm/s. Polymaker doesn't explain the gap or name the nozzle size behind either figure. ELEGOO gives one figure, below 100 mm/s. Bambu's figure of about 100 mm/s for fiber filament on a 0.4 mm hardened nozzle is closer to ELEGOO's guidance and Polymaker's 60 mm/s than to 300 mm/s. Treat any top speed as a ceiling, not a target.

Drying and moisture

Nylon absorbs water, and both makers treat drying as essential. They differ on the setting and on how much heat your dryer needs.

• Polymaker gives 100 °C for 10 hours in a regular oven, or level 3 for 18 hours in its PolyDryer, and says to store and use the filament below 20% RH. Its print settings add "(Only if the material has absorbed moisture)," while its printing tips say to "dry at 100°C for 10 hours before use." Its data sheet shows an equilibrium water absorption of 3.3%, and its wet-state figures show what moisture does to printed parts. After annealing and soaking in 60 °C water for 48 hours, X-Y tensile strength drops from 109.3 to 54.7 MPa, and Young's modulus from about 8,637 to 2,508 MPa. Polymaker also warns that if this filament is its own support material, you should remove the supports "before excessive moisture absorption," or they can bond permanently.
• ELEGOO marks drying before use as "Required," at 80 ± 5 °C for 8 hours, and says to print and store at or below 20% RH, sealed with desiccant.

Check your dryer's top temperature before buying. Polymaker's oven setting needs 100 °C, which many filament dryers don't reach, and ELEGOO's needs 80 ± 5 °C. Neither maker publishes a temperature rating for its spool, so check the spool can take the heat too. Our filament dryer vs dry box guide and filament storage guide cover the options.

Annealing and moisture conditioning

Polymaker builds post-processing into its guidance. It recommends annealing printed parts "in the oven at 100°C for 16 hours," and its data sheet notes that the specimens for its mechanical property tables were annealed that way. It also describes moisture conditioning, letting the part absorb water after annealing, because annealing in a convection oven dries the part out. So the headline strength figures assume an oven step you'd need to repeat for your own parts; the sheet doesn't say whether its heat figures were measured on annealed specimens. ELEGOO publishes no annealing or conditioning guidance for PAHT-CF on the pages we checked.

Strength and heat figures: listed separately

Polymaker's data sheet names ISO test methods and gives its specimen settings: printed at 300 °C on a 50 °C bed, 100% infill, two shells, three top and bottom layers, fan off, with mechanical specimens annealed as described above. ELEGOO's specification table lists figures without naming any test method or how the specimens were printed. Different methods and print settings change results, so we list each maker's figures on its own.

Polymaker Fiberon PA6-CF20 (TDS V1.1)

• Heat deflection temperature: 173 °C at 1.8 MPa and 215 °C at 0.45 MPa (ISO 75); annealing not stated for these specimens
• Vicat softening temperature: 219.2 °C (ISO 306, GB/T 1633)
• Melting temperature: 218.5 °C; glass transition: 74.2 °C (DSC, 10 °C/min)
• Tensile strength: 109.3 ± 2.4 MPa X-Y, 54.0 ± 5.2 MPa Z (ISO 527, GB/T 1040; dry, annealed)
• Young's modulus: 8636.5 ± 211.4 MPa X-Y, 3759.5 ± 118.5 MPa Z (ISO 527, GB/T 1040; dry, annealed)
• Bending strength: 161.0 ± 3.9 MPa X-Y, 71.3 ± 17.7 MPa Z (ISO 178, GB/T 9341; dry, annealed)
• Charpy impact, X-Y: 11.0 ± 0.3 kJ/m² notched, 24.0 ± 1.0 kJ/m² unnotched; Z unnotched 7.5 ± 2.7 kJ/m² (ISO 179, GB/T 1043; dry, annealed)
• Density: 1.17 g/cm³ at 23 °C (ISO 1183, GB/T 1033)

ELEGOO PAHT-CF (product page, no methods named)

• Heat deflection temperature: 194 °C at 0.45 MPa; no 1.8 MPa figure
• Vicat softening temperature: 225 °C
• Melting temperature: 225 °C
• Tensile strength: 87 ± 3 MPa X-Y, 41 ± 1 MPa Z
• Bending strength: 138 ± 3 MPa X-Y, 63 ± 3 MPa Z
• Bending modulus: 5089 ± 54 MPa X-Y, 2048 ± 105 MPa Z
• Impact strength: 70.4 ± 3.4 kJ/m² X-Y, 19.4 ± 3.1 kJ/m² Z, test type not stated
• Density: 1.08 g/cm³

Both makers give a heat deflection figure at 0.45 MPa, but without ELEGOO's method or specimen details, the 21 °C gap isn't a measured difference. The impact figures show the problem more clearly. Polymaker's 11.0 kJ/m² is a notched Charpy result, and ELEGOO doesn't say whether its 70.4 kJ/m² was notched or which method it used. Both makers' figures do agree on one thing: the Z direction, between layers, is far weaker than X-Y, so orient parts so the main load runs along the layers.

Bambu's AMS and third-party fiber nylon

If you own a Bambu Lab printer with an AMS, this matters more than any spec. Bambu's Notes for AMS say to avoid "third-party fiber reinforcement materials (PA-CF/GF, PET-CF/GF, PLA-CF /GF, etc.)" because they "may wear AMS PTFE tubes" and cause "brittle breaks, and other problems," while its own "PLA-CF, PETG-CF, PAHT-CF and other official filaments are specially optimized." Its filament guide lists "certain brands of" PA-CF/GF and PAHT-CF/GF as both "Too brittle" and "Too hard and rough" for the AMS and AMS lite, and its compatibility entry for PA-CF, PA6-CF, and PAHT-CF names only "Bambu PA-CF, PAHT-CF" as compatible.

Neither filament here is Bambu's, so Bambu's guidance points both to the external spool holder. The makers' own statements don't change that:

• Polymaker answers "Will the spools work in an AMS?" with "Yes! We have redesigned the edges of our spools so all Polymaker products will now spin great in the AMS," then adds "you will need to be careful when using any abrasive materials in the AMS." That answer is about the spool, not the abrasive filament.
• ELEGOO 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 it in PETG. That's also about the spool, and ELEGOO doesn't say PAHT-CF is AMS compatible.

Both makers also want this filament kept below 20% RH while printing, so a sealed dry box feeding the printer directly suits both. Our AMS filament compatibility guide covers Bambu's rules and the external spool route.

What each maker says it's for

• Polymaker Fiberon PA6-CF20. Polymaker pitches it for "functional prototypes, industrial tooling, automotive, and composite manufacturing applications," claiming "Tensile strength up to 109 MPa," heat resistance up to 215 °C, "Minimal warping," and chemical resistance. It says the filament is "the same proven formula as PolyMide™ PA6-CF," which it replaces, though it "may print in a slightly darker black shade."
• ELEGOO PAHT-CF. ELEGOO pitches it for "motor housing, engine bay parts, and high-temperature fixtures," as well as drone, automotive, and industrial parts, gears, and bearings. It claims the filament withstands "temperatures up to 194 °C," that carbon fiber "minimizes shrinkage and warping," and that it gives a matte finish that hides layer lines.

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

Polymaker

Polymaker Fiberon PA6-CF20 (Black, 1.75 mm, 1 kg)

Best for

Stiff, heat-resistant jigs, fixtures and tooling on a printer with a 300 °C hardened hotend and a dry box.

Skip this if

Your hotend tops out below 280 °C, you can't anneal parts, or you can't keep filament below 20% RH.

Specs, strengths, and limitations

Material

PA (PA6, 20% carbon-fiber filled)

Diameter

1.75 mm

Net filament

1000 g (filament only, not packaged weight)

Format

other

Maker's nozzle range

280–300 °C

Nozzle

Abrasive: the maker recommends a wear-resistant nozzle

Strengths

• TDS lists 109.3 MPa X-Y tensile strength and 8636 MPa X-Y Young's modulus (dry, annealed).
• TDS lists a heat deflection temperature of 173 °C at 1.8 MPa.
• Manufacturer states minimal warping and chemical resistance; the TDS calls for a room-temperature chamber, not a heated one.

Limitations

• Abrasive: Polymaker requires a hardened (or ruby) nozzle of 0.4 mm or larger; brass lasts about 9 h.
• Needs a 280–300 °C all-metal hotend, plus annealing at 100 °C for 16 h for the stated properties.
• PA6 is moisture-sensitive: TDS wet-state tensile strength drops to 54.7 MPa, and it must be dried at 100 °C for 10 h and kept below 20% RH.

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

ELEGOO

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

Best for

Heat-resistant nylon parts such as motor mounts and under-hood brackets on an enclosed printer with a hardened nozzle and a dryer.

Skip this if

Your printer is open-frame, can't reach 260 °C, or you have no way to dry filament at 80 °C.

Specs, strengths, and limitations

Material

PA (PAHT (high-temperature nylon), carbon-fiber reinforced)

Diameter

1.75 mm

Net filament

1000 g (filament only, not packaged weight)

Format

other

Maker's nozzle range

260–290 °C

Nozzle

Abrasive: the maker recommends a wear-resistant nozzle

Strengths

• Product page lists a heat deflection temperature of 194 °C (0.45 MPa), for parts near motors or engines.
• Specification table lists 87 MPa X-Y tensile strength and 5089 MPa X-Y bending modulus.
• Manufacturer states carbon fiber reduces shrinkage and warping and improves wear resistance.

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 an enclosed printer (45–60 °C chamber), a 260–290 °C hotend, a 90–110 °C bed and bed glue.
• Must be dried at 80 °C for 8 h and kept at ≤ 20% RH; slow at under 100 mm/s.

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 Polymaker Fiberon PA6-CF20 if…

• Your all-metal hotend and hardened nozzle (0.4 mm or larger) run comfortably at 280–300 °C.
• Your printer is open or doesn't heat its chamber, and you'd rather print on a 40–50 °C bed with the fan off.
• You can dry at 100 °C and anneal finished parts at 100 °C for 16 hours.
• You want a maker that states the fiber content and publishes ISO test methods and specimen settings.

Choose ELEGOO PAHT-CF if…

• You have an enclosed printer that reaches a 45–60 °C chamber and a 90–110 °C bed, with a hardened steel nozzle of 0.4 mm or larger.
• Your hotend runs at 260–290 °C rather than 300 °C.
• Your dryer reaches ELEGOO's 80 ± 5 °C but not 100 °C.
• You're happy to use glue on the plate and print below 100 mm/s.

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 2026-10-10. We haven't printed with either filament for this page, so nothing here is a measured result of ours. Polymaker's own pages disagree in places:

• Print settings. The specification panel gives a 25–50 °C bed and a 60 mm/s maximum speed, where the data sheet and print settings give a 40–50 °C bed and the data sheet up to 300 mm/s. We use the data sheet.
• Moisture content. Its FAQ gives an average moisture content of 2.57% for its wet-conditioned specimens, where the data sheet says 5.30%.
• Spool sizes. The same FAQ says Polymaker isn't "offering 1KG Fiberon™ options," but the store lists a 1 kg Fiberon PA6-CF20 spool (FG03003), which is the variant covered here.

ELEGOO's specifications are on its product page rather than in a separate data sheet, and we found no ELEGOO page giving PAHT-CF test methods or spool dimensions. Its product description and specification table don't state fiber content. Replies in the product page's Q&A section are labelled "Customer" rather than ELEGOO, so we didn't use them. 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 ↗