eSUN PA-CF Filament

eSUN PA-CF is an engineering nylon filament reinforced with carbon fiber for FDM/FFF 3D printing of strong, rigid, wear-resistant and functional parts. The material is also known as ePA-CF and belongs to eSUN’s professional composite filament range for technical applications where standard PLA, PETG or decorative materials no longer provide enough strength, impact resistance, stability and service life.

PA-CF is based on nylon with added carbon fiber. This combination gives the material high rigidity, improved strength, good impact resistance, wear resistance, dimensional stability and a characteristic matte carbon-fiber surface. Printed parts look technical and clean, while carbon fiber filling helps reduce deformation and improve model stability during printing.

eSUN PA-CF is suitable for mechanical components, gears, housings, brackets, holders, automotive parts, industrial fixtures, jigs, equipment parts, aerospace prototypes, electrical and electronic components and other products that require high strength, rigidity, wear resistance and reliable performance.

What is PA-CF

PA-CF is a polyamide, or nylon, filament reinforced with carbon fiber. Unlike PETG-CF, which is easier to print and more suitable for general technical parts, PA-CF is intended for more demanding functional parts. It is a better choice when impact resistance, abrasion resistance, mechanical strength, rigidity and long-term operation are important.

Compared with PET-CF, PA-CF has a more pronounced nylon behavior: good toughness, ability to work in mechanical assemblies, wear resistance and suitability for parts such as gears, sliding elements and mounting components. At the same time, PA-CF requires more careful drying, storage and printing because nylon is moisture-sensitive.

✅ Key advantages of eSUN PA-CF

• Nylon reinforced with carbon fiber: combines polyamide strength with carbon fiber rigidity.
• High strength: suitable for functional parts working under load.
• High rigidity: carbon fiber reduces flexibility and improves shape stability.
• High impact resistance: suitable for parts that must withstand mechanical impact.
• Wear resistance: PA-CF is suitable for gears, mounts, guides and working elements.
• Self-lubricating nylon behavior: useful for mechanical components and parts with friction.
• Heat resistance: heat deflection temperature reaches 155 ℃ at 0.45 MPa.
• Dimensional stability: carbon fiber helps reduce shrinkage, warping and cracking.
• Matte surface: printed parts have a clean technical look without strong gloss.
• Black engineering color: universal for industrial, automotive and functional parts.

Color and appearance

eSUN PA-CF is available in black. This is the classic engineering color for carbon-fiber-reinforced nylon composites. Printed parts have a matte, slightly textured surface that looks more professional than standard glossy plastics.

📐 Technical specifications

📊 Physical and mechanical properties

For FDM printing descriptions, XY/Z values are useful because they show the difference between in-layer strength and inter-layer strength.

TDS reference values

The technical data sheet also provides typical values for ePA-CF. They can be used as reference material data, but for FDM product cards it is better to also consider XY/Z values because the final strength of a printed part depends on model orientation, temperature, drying, infill and layer adhesion quality.

Heat resistance

eSUN PA-CF has high heat resistance for an FDM filament. Its heat deflection temperature is 155 ℃ at 0.45 MPa, making it suitable for parts that need to maintain shape at elevated temperatures.

Real heat resistance of a printed part depends not only on the material, but also on geometry, layer orientation, wall thickness, infill percentage, print quality and load conditions. For critical applications, the part should be tested in real operating conditions.

⚙️ Recommended Printing Parameters

eSUN PA-CF printing recommendations

• Dry the spool at 70 ℃ for more than 12 hours before printing.
• During printing, use an eBOX, dry box or sealed filament container.
• Do not leave PA-CF open in a humid room: nylon absorbs moisture quickly.
• Use a hardened steel, ruby, tungsten carbide or another wear-resistant nozzle.
• For long print jobs, a 0.6 mm or larger nozzle is preferable to reduce clogging risk.
• Do not use a standard brass nozzle for regular printing: carbon fiber quickly wears brass.
• If possible, use hardened steel extruder gears because the material is abrasive.
• Avoid sharp bends in the filament path: PA-CF is rigid and does not tolerate tight bending well.
• For functional parts, start at 40–60 mm/s and increase speed after profile tuning.
• Cooling is usually disabled to improve layer adhesion.
• For better bed adhesion, use a brim or skirt, especially on large parts.
• After printing, let the part cool gradually to reduce internal stress.

Best applications for eSUN PA-CF

• ⚙️ Functional engineering parts.
• ⚙️ Gears, toothed wheels and mechanical elements.
• 🔩 Brackets, mounts, fixtures, holders and installation components.
• 🏭 Industrial jigs, fixtures and tool fixtures.
• 🚗 Automotive parts, technical inserts and functional prototypes.
• ✈️ Aerospace prototypes and lightweight rigid components.
• 🔌 Electrical and electronic components, housings, panels and protective elements.
• 🧩 Parts for 3D printers, machines, equipment and working mechanisms.
• 🛠️ Parts exposed to friction, load, vibration and increased wear.
• ⚫ Black matte technical parts with carbon-fiber texture.

PA-CF vs PET-CF vs PETG-CF vs PLA-CF vs PA12-CF

3D printer compatibility

eSUN PA-CF is compatible with FDM/FFF 3D printers using 1.75 mm filament, supporting a 260–300 ℃ nozzle temperature range and a heated bed. Stable printing requires a high-temperature hotend, a wear-resistant nozzle, dry filament and stable feeding.

The material can be printed on Bambu Lab, Creality, Prusa, Anycubic, QIDI, Flashforge, Raise3D, Voron and other FDM/FFF printers if the printer supports the required temperature, stable feeding of rigid composite filament and work with abrasive materials.

For hotends with PTFE tubing, check the maximum allowed temperature. For long PA-CF printing, an all-metal hotend is recommended. It is also important to avoid sharp bends in the feeding path because PA-CF is rigid and not as flexible as standard nylon or TPU.

Why a wear-resistant nozzle is needed

PA-CF contains carbon fiber, so the material is abrasive. A standard brass nozzle wears quickly during regular printing: the nozzle opening becomes larger, extrusion becomes less accurate, line width changes and part surface quality becomes worse.

For PA-CF, hardened steel, ruby, tungsten carbide or another wear-resistant nozzle is recommended. A 0.4 mm nozzle can be used for small parts, but for long print jobs, stable feeding and reduced clogging risk, a 0.6 mm or larger nozzle is often better.

Drying and storage

PA-CF must be printed dry. Wet nylon can hiss during extrusion, cause bubbles, unstable feeding, weak layer adhesion and rough surface. Therefore drying and storage are critical conditions for high-quality printing.

• Dry PA-CF at 70 ℃ for more than 12 hours before printing.
• Use a dry box or eBOX during printing.
• After printing, return the spool to a sealed bag or container immediately.
• Store the material with silica gel or another desiccant.
• Do not leave the spool open on the table, especially in a humid room.
• If bubbles, popping, smoky extrusion, roughness or weak strength appear, dry the material again.

Design notes for PA-CF parts

To obtain strong PA-CF parts, the model should be designed for FDM printing. Consider layer direction, load direction, wall thickness, number of perimeters, infill type and stress concentration areas.

• Increase the number of walls for loaded parts.
• Avoid very thin walls in high-load areas.
• Orient the model so that the main load does not split the part along the Z direction.
• Use fillets instead of sharp internal corners.
• For mounting holes, consider possible post-processing: drilling, reaming or installing threaded inserts.
• For gears and sliding parts, test clearances on the actual printer and profile.

Post-processing and safety

PA-CF parts can be drilled, sanded, fitted and mechanically processed, but this should be done carefully. Dust from carbon-fiber-filled materials should not be inhaled, so eye protection, a mask or respirator and ventilation are recommended during post-processing.

The material can burn when exposed to fire and high temperature. During printing and storage, avoid open flames, sparks, overheating and contact with strong oxidizing agents. Print in a ventilated area and do not inhale dust, smoke or overheating products.

📄 File Download: technical files and certificates

• PA-CF Parameters for Bambu Lab & Creality — starting profiles and printing parameters.
• TDS — technical data sheet.
• MSDS/SDS — material safety data sheet.
• REACH — SVHC report.
• RoHS — restricted substances report.

FAQ

Why buy eSUN PA-CF

eSUN PA-CF is an engineering material for users who need strong, rigid, wear-resistant and impact-resistant parts. It is suitable for mechanics, automotive components, industrial fixtures, gears, housings, mounts, aerospace prototypes and functional products where standard materials do not provide enough strength and service life.

If you need more than a decorative plastic, and you need a material for real working parts, PA-CF is one of the most practical options in eSUN’s carbon-fiber engineering filament range. With proper drying, dry box printing, a wear-resistant nozzle and a tuned profile, it can produce strong, stable and professional parts with a matte carbon-fiber surface.