Nylon-CF starts with a nylon base, usually PA6, PA12, or PA11, with chopped carbon fiber mixed in at roughly 10 to 20 percent by weight, the same approach used for any other CF blend. What makes nylon-CF different is that the base resin itself splits into chemistries that don’t behave the same way, so two spools labeled “nylon-CF” from different brands can print, dry, and perform quite differently before fiber content is even a factor. The fiber does its usual job: parts get stiffer, hold their shape better under sustained load, and warp less than unfilled nylon. What it doesn’t reliably do is fix nylon’s biggest problem. Some formulations absorb noticeably less moisture than plain nylon; others barely improve on it, and guessing wrong ruins a print faster than almost anything else in FDM. If you haven’t printed nylon before, start with the nylon print settings guide first, since this one assumes you already know why drying and bed adhesion matter and focuses on what carbon fiber changes.
What’s actually in the blend
Chopped carbon fiber, not woven cloth or continuous strand, gets mixed into nylon pellets before extrusion, the same approach used for PETG-CF, PLA-CF, and PC-CF. Where nylon-CF branches off from those is the base resin. Bambu Lab alone sells two chemistries under the nylon-CF umbrella: PAHT-CF, built on PA12, and PA6-CF, built on PA6. Polymaker’s PolyMide PA6-CF runs 20 percent carbon fiber by weight on a PA6 base. Prusament’s PA11 Carbon Fiber uses yet another polyamide, PA11, and 3DXTech sells CarbonX versions in both PA6 and PA12. None of these are interchangeable despite sharing the same shorthand. PA6 tends to be stiffer and cheaper but thirstier for water; PA12 and PA11 trade some of that stiffness for better moisture and chemical resistance. That split matters more here than with PETG-CF, where the base plastic stays the same chemistry no matter which brand made it. For how nylon-CF fits alongside carbon fiber versions of other filaments, see the carbon fiber 3D printing guide.
Stiffness goes up, but the numbers disagree
Every data sheet checked for this guide agrees that carbon fiber raises nylon’s stiffness. They don’t agree by how much. Polymaker’s PolyMide PA6-CF lists a tensile strength up to 109 MPa and a Young’s modulus above 8.6 GPa in the XY plane, with a heat deflection temperature of 215°C. 3DXTech’s CarbonX Nylon 6+CF, also a PA6 blend, reports a lower tensile strength of 63.9 MPa and a tensile modulus of 4387 MPa, and its own heat deflection numbers disagree from page to page: 102°C in one data sheet, 147°C for the current Gen3 formulation, and 175°C on its own PA6-CF vs PA12-CF comparison page. Prusament’s PA11 Carbon Fiber, a different polyamide entirely, lists a flexural modulus of 3050 MPa and rates parts for continuous use up to 190°C. Treat any “X times stiffer” claim as specific to that brand’s spool, not the nylon-CF category, and check the actual data sheet before designing around a number pulled from a product page.
Nozzle requirements and wear
Carbon fiber is abrasive no matter which nylon carries it, and every manufacturer checked here says so. 3DXTech’s data sheet calls its CarbonX nylon blends highly abrasive and states tool heads need hardened steel components. Bambu Lab specifies a hardened steel nozzle for both PAHT-CF and PA6-CF, recommending 0.6mm or larger to cut down on clogging from stray fiber strands. Prusament calls a hardened steel nozzle essential for its PA11 Carbon Fiber. A brass nozzle still extrudes nylon-CF for a while, but the opening widens as fiber wears it down, and extrusion width creeps up before most people notice why tolerances are drifting. Swap to hardened steel, coated, or carbide before loading a spool. For more on wear rates and nozzle materials, see the brass vs hardened steel nozzle guide.
Print settings: nozzle, bed, speed
Nozzle temperature splits by base polymer more than by brand. Bambu Lab’s PA12-based PAHT-CF runs 260-300°C, while its own PA6-CF runs cooler at roughly 255-280°C, a gap wide enough to matter if “Bambu nylon-CF” gets treated as one setting. 3DXTech’s CarbonX Nylon 6+CF prints at 240-270°C, its Nylon 12+CF at 265-285°C, and Prusament’s PA11 Carbon Fiber calls for 285±5°C, the hottest of the group. Bed temperatures run high across the board: Bambu recommends 100-120°C on PEI, 3DXTech’s Nylon 12+CF wants 90-110°C, and Prusament specifies 110±10°C. A heated chamber is recommended by every brand here, though carbon fiber’s reduced warping means small parts sometimes get away without one. Bambu caps speed under 100mm/s on PAHT-CF, and cooling fans stay low across the board, 0-40 percent, the same range plain nylon uses for the same reason: aggressive cooling on a hot, moisture-sensitive material causes more problems than it solves.
Drying: the discipline nylon-CF doesn’t relax
Plain nylon can absorb up to 10 percent of its own weight in water, a figure the nylon print settings guide covers in more depth. Carbon fiber changes that number, but not the same way in every formulation, since fiber itself doesn’t absorb moisture, so a composite that’s 20 percent fiber by weight simply has less hygroscopic polymer to soak up water than the unfilled resin. 3DXTech’s own comparison of its two CarbonX grades puts the difference in concrete terms: PA6-CF absorbs an estimated 3 to 9 percent moisture by weight, its PA12-CF under 1 percent. That gap means a PA12-based nylon-CF like Bambu’s PAHT-CF or 3DXTech’s Nylon 12+CF tolerates a humid workshop far better than a PA6-based spool, even though PA6 grades usually win on raw stiffness. None of this makes drying optional. Bambu recommends 80°C for 8-12 hours for PAHT-CF, or 90-100°C for 12 hours using its heated-bed method; 3DXTech’s CarbonX Nylon 6+CF and Nylon 12+CF both call for 90°C for at least 4 hours, and its PA6-CF alternative Obsidian CF V2 uses a gentler 80°C for 6 hours. PETG-CF dries the way plain PETG does and tolerates more neglect between prints. Nylon-CF doesn’t extend that patience: keep it in a dry box or actively drying while it feeds, especially on longer jobs.
When nylon-CF is worth it
Nylon-CF earns its price on parts that need to hold a precise shape under continuous stress: drone frames, RC chassis parts, jigs, fixtures, gears, and brackets that would flex or creep in unfilled nylon. It also keeps more of nylon’s toughness than PETG-CF keeps of PETG’s, which is the real difference between the two. The PETG-CF guide notes that fiber cuts PETG’s elongation at break sharply; nylon-CF gives up less impact resistance for the same stiffness gain, since nylon started tougher. Against plain nylon, the case is simple: less warping, often no enclosure needed on smaller parts, and better dimensional holding under load, at the cost of a pricier spool and a nozzle replaced sooner. Inside the nylon-CF family, PA6-CF wins on stiffness and heat resistance while PA12-CF wins on moisture and chemical resistance, so the right pick depends on where the part lives, not just what it does. For lighter needs, the filament types overview and the engineering filaments guide both cover where nylon-CF sits against PC, PETG-CF, and unfilled nylon.
Nylon-CF filament checklist
- Dry before every print regardless of brand; PA6-based nylon-CF needs it more urgently than PA12-based versions, but neither one skips this step.
- Check the specific data sheet for drying time and temperature: figures range from 80°C for 6 hours to 90-100°C for 12 hours depending on brand and base polymer.
- Use a hardened steel, coated, or carbide nozzle, 0.4mm or larger; a standard brass nozzle wears out fast under carbon fiber.
- Set nozzle temperature by base polymer, not by brand: roughly 240-280°C for PA6-CF, 260-300°C for PA12-based PAHT-CF, and around 285°C for PA11-CF.
- Expect a hot bed, typically 90-120°C, on a PA-specific or PEI surface matched to the spool’s own data sheet.
- Use a heated chamber where possible; carbon fiber reduces warping compared with unfilled nylon but doesn’t remove the benefit of stable ambient heat.
- Keep the cooling fan low or off, the same range plain nylon settings use.
- Store opened spools in a dry box with desiccant between prints; nylon-CF reabsorbs moisture faster than PETG-CF does.
- Reach for nylon-CF on stiffness- and heat-critical mechanical parts like drone frames, jigs, and brackets, not on parts where plain nylon’s flexibility or PETG-CF’s simpler drying routine would do the job as well.