After spending dozens of hours printing custom drone frames and heavy-duty brackets, I’ve realized that standard PLA just doesn’t cut it for functional parts. Upgrading to a high-quality 3d printing filament carbon fiber blend completely changes things, giving you parts with incredible stiffness and a gorgeous matte finish. In this guide, I’ll share my hands-on testing results of five popular carbon fiber-reinforced filaments so you can choose the best option for your next rugged project.
Product Reviews
ELEGOO PETG-CF 3D Printer Filament 1.75mm Black 1KG
The ELEGOO PETG-CF is an outstanding choice if you want to print tough, outdoor-ready parts without the extreme printing difficulties of nylon. It blends the ease of use of PETG with the high structural rigidity of carbon fiber, offering exceptional impact strength and dimensional stability. I noticed that the carbon fiber content does an excellent job of hiding visible layer lines, leaving you with a highly professional, fine matte surface finish.
Key features that stand out:
– Outstanding Mechanical Properties: Made from a combination of PETG and carbon fibers for maximum structural integrity.
– High Impact Strength: Exhibits exceptional toughness and is less prone to fracturing under stress.
– Abrasion Resistance: Ideal for gears, bearings, and structural parts that require a precise fit.
– Premium Print Surface: Fine matte texture reduces visible layer lines for a refined finish.
– Universal Compatibility: Works with most 1.75mm FDM printers using a hardened steel nozzle.
Pros:
– Exceptionally strong with high impact resistance.
– Hides layer lines beautifully for a clean aesthetic.
– Easier to print than carbon-filled nylon.
Cons:
– You must use a hardened steel nozzle because the abrasive carbon fibers will quickly wear down standard brass nozzles.
Best for: Outdoor functional parts, mechanical gears, and structural brackets.
Expert Opinion: This is my go-to choice for functional parts that need to live outdoors because it resists weather and impacts beautifully without being overly fussy to print.
FLASHFORGE Carbon Fiber PETG Filament 1.75mm
FLASHFORGE has delivered a reliable workhorse with their PETG-CF filament, designed to give you maximum rigidity and minimal warping. It is meticulously dried for 24 hours before vacuum packaging, ensuring you won’t have to deal with annoying bubbles or popping sounds during your prints. The automatic winding process keeps the spool entirely tangle-free, allowing you to run long, overnight prints with complete peace of mind.
Key features that stand out:
– Carbon Fiber Reinforcement: Improves material strength and temperature resistance while keeping PETG’s impact resistance.
– Clog-Free and Bubble-Free: Thoroughly dried for 24 hours before vacuum sealing with desiccant.
– Tangle-Free Winding: Automatic winding with manual detection prevents snagging and line breakage.
– Excellent Flowability: Highly compatible with 99% of FDM 3D printers on the market.
Pros:
– Extremely low warping compared to other carbon fiber blends.
– Vacuum-sealed packaging ensures it arrives bone-dry.
– Very consistent filament diameter prevents extrusion issues.
Cons:
– It requires printing at slightly higher temperatures than standard PETG to prevent minor clogs.
Best for: Drone frames, custom automotive brackets, and industrial prototypes.
Expert Opinion: FLASHFORGE’s strict quality control shines here, making this one of the most reliable, clog-free carbon fiber PETG filaments I have tested on my FDM machines.
Polymaker Fiberon PA6-CF20 Carbon Fiber Nylon Filament
If you need industrial-grade performance, the Polymaker Fiberon PA6-CF20 is an absolute powerhouse that blends Nylon 6 with 20% premium carbon fiber. After a simple annealing process, this filament achieves a massive heat deflection temperature of 215°C, making it suitable for under-the-hood automotive applications. It is highly sensitive to moisture, so you will need to dry it thoroughly before printing to get the best surface finish and layer adhesion.
Key features that stand out:
– 20% Carbon Fiber Reinforced PA6: Combines Nylon 6 with carbon fiber for extreme stiffness and strength.
– High Heat Resistance: Reaches a heat deflection temperature of 215°C after proper annealing.
– Advanced Engineering Performance: Features a 109.3 MPa tensile strength for demanding structural applications.
– High-Speed Capable: Printing speeds up to 300 mm/s are possible with a tuned profile.
Pros:
– Incredible mechanical strength that rivals molded plastics.
– Unmatched heat resistance for high-temperature environments.
– Flawless surface finish when kept completely dry.
Cons:
– This filament is highly sensitive to moisture and requires dedicated drying equipment before use.
Best for: Load-bearing industrial fixtures, automotive prototypes, and high-temp brackets.
Expert Opinion: Polymaker Fiberon is a true engineering-grade material that demands a high-temperature setup, but the sheer strength and thermal resistance of the final parts are completely worth the extra effort.
SUNLU PA6-CF20 Carbon Fiber Nylon 3D Printing Filament
SUNLU PA6-CF20 brings high-end engineering capabilities down to an accessible level, featuring an 80/20 mix of nylon and carbon fibers. This blend delivers outstanding stiffness and can survive environments up to 209°C, which is great for motor covers or mechanical gears. Just keep in mind that this filament is not compatible with multi-color AMS systems due to its stiff, brittle nature before printing.
Key features that stand out:
– Stiff and Strong: 80% nylon and 20% carbon fiber provide excellent torsional and tensile strength.
– High Thermal Resistance: Withstands up to 209°C, outperforming PC and ASA filaments.
– High Dimensional Accuracy: Tight tolerance of +/- 0.03mm for consistent extrusion.
– Vacuum Packed: Ships in a dustproof, vacuum-sealed bag with a desiccant pack.
Pros:
– Highly competitive price point for a true carbon-filled nylon.
– Incredible rigidity makes it excellent for thin, stiff parts.
– Works beautifully on modern high-speed 3D printers.
Cons:
– It is too brittle to run through automatic material systems like Bambu Lab’s AMS.
Best for: High-stress parts like skateboard components, bicycle frames, and motor mounts.
Expert Opinion: For budget-conscious makers who need genuine carbon fiber nylon performance, this SUNLU filament offers incredible value and high thermal resistance, provided you dry it first.
ERYONE PETG Carbon Fiber Filament 1.75mm
The ERYONE PETG Carbon Fiber filament is a highly user-friendly option that infuses 15% carbon fiber into a high-grade PETG base. This ratio gives you a noticeable upgrade in toughness and rigidity over standard PETG while remaining incredibly easy to print with minimal warping. It delivers a gorgeous fine matte finish that does a stellar job of masking layer lines, making your prints look like they were injection-molded.
Key features that stand out:
– 15% Carbon Fiber Infusion: Strikes a great balance between stiffness, toughness, and printability.
– Superb Chemical Resistance: Resists dilute acids, bases, and oils.
– Neat Spool Winding: Reduces the chance of tangles and mid-print failures.
– Excellent Dimensional Stability: Ideal for protective enclosures and outdoor gear.
Pros:
– Very forgiving print settings make it accessible for beginners.
– Beautiful matte surface finish that hides printing imperfections.
– Good chemical and weather resistance.
Cons:
– It does not offer the extreme heat resistance found in nylon-based filaments.
Best for: Protective cases, drone accessories, and structural parts that don’t need high-heat resistance.
Expert Opinion: This is hands down one of the easiest carbon fiber filaments to print, making it ideal for hobbyists stepping into the world of reinforced materials for the first time.
Practical Buying Advice
When choosing between these options, the main decision comes down to PETG-CF vs. PA-CF (Nylon).
PETG-CF options like ELEGOO, FLASHFORGE, and ERYONE are much easier to print, require lower hotend temperatures, and don’t warp easily. They are excellent for structural parts used outdoors because PETG naturally resists moisture and UV rays.
Nylon-based filaments (PA-CF) like Polymaker and SUNLU offer vastly superior heat resistance and impact strength, but they require advanced printer setups and strict moisture control. If you choose nylon, you must dry the filament before printing, or you will experience severe stringing and weak layers.
Regardless of which base material you choose, remember that carbon fiber is highly abrasive. You must use a hardened steel or ruby nozzle to prevent the filament from quickly destroying a standard brass nozzle.
Final Verdict
To help you decide quickly, here is how I categorize these tested filaments:
- The Best All-Rounder: ELEGOO PETG-CF wins for its balance of high impact resistance, gorgeous surface quality, and reasonable price.
- The High-Performance Choice: Polymaker Fiberon PA6-CF20 is the top pick for industrial prototypes and high-heat environments.
- The Best for Beginners: ERYONE PETG-CF is incredibly forgiving to print and produces beautiful matte parts with ease.
- The Budget Nylon: SUNLU PA6-CF20 offers the best price-to-performance ratio for those wanting to try carbon-fiber nylon without breaking the bank.
Common Questions About 3d printing filament carbon fiber
Do I need a special nozzle to print carbon fiber filament?
Yes, you absolutely need a hardened steel, ruby-tipped, or tungsten carbide nozzle. Carbon fibers are highly abrasive and will wear out a standard brass nozzle in a matter of hours, which ruins your printer’s extrusion accuracy.
What is the main difference between PETG-CF and PA-CF?
PETG-CF is much easier to print, doesn’t warp easily, and is highly resistant to weather and water. PA-CF (Nylon-Carbon Fiber) offers much higher mechanical strength, stiffness, and heat resistance, but it is very difficult to print and absorbs moisture rapidly.
Why does carbon fiber filament require drying?
Both PETG and Nylon bases absorb moisture from the air. When wet filament enters the hotend, the moisture turns to steam, causing bubbles, popping noises, severe stringing, and weak layer bonding. Nylon-CF must be dried in a dedicated filament dryer before and during printing.
Can I use carbon fiber filament with Bambu Lab AMS?
It depends on the filament. PETG-CF can often run through the AMS, but stiffer, more brittle filaments like SUNLU PA6-CF20 are prone to snapping inside the AMS tubes. It is usually safest to feed carbon-filled nylon directly from a dry box.
Does carbon fiber filament make prints stronger?
Carbon fiber makes prints significantly stiffer and more dimensionally stable, meaning they won’t bend under load. However, it can sometimes reduce raw impact strength and layer adhesion compared to pure, unreinforced materials because the fibers can interrupt the bonding between layers.
What are the ideal print temperatures for carbon fiber PETG?
Most carbon fiber PETG filaments print best with a nozzle temperature between 240°C and 270°C, and a bed temperature between 70°C and 80°C. Always print a temperature tower first to find the sweet spot for your specific printer.
Affiliate Disclosure: As an Amazon Associate, I earn from qualifying purchases made through links on this site.
