Carbon Fiber: How Continuous Fiber Printing Is Transforming Manufacturing
Sep 25, 2026
Carbon fiber is a material made of extremely thin strands of carbon atoms, valued for offering very high stiffness and strength at a fraction of the weight of steel or aluminum.
The new buzzword in the manufacturing world is “continuous carbon fiber”. More companies are now shifting to carbon fiber-based products, and additive manufacturing processes have started incorporating continuous carbon fibers. It is not wrong to say that continuous carbon fiber has a promising future.
In manufacturing there is always a requirement for superior physical and mechanical properties. Carbon fiber provides strength, stiffness, high heat resistance, fine surface texture and theoretically infinite fatigue life, which is why it can be a worthy substitute for expensive traditional materials like aluminum, steel and iron.
This article covers:
- What is carbon fiber?
- How carbon fiber is replacing traditional materials
- What makes continuous carbon fiber suitable for manufacturing
- Where continuous carbon fibers are used today
What is carbon fiber?
Individual carbon fibers measure about 5 to 10 micrometres in diameter (thinner than a human hair) and thousands are bundled into a tow, then woven or laid into a resin to form the finished material. That structure is what produces the property set below, and why the material has been gaining ground across manufacturing:
- High stiffness: carbon fibers do not lose their shape under high stress. Deflection under a given load is very small compared with any other material.
- High heat resistance: unlike materials such as PLA or ABS, carbon fibers resist heat well, which is why they are often mixed with those substances to compensate for their shortcomings.
- Strength: a good strength-to-weight ratio, allowing quality performance even at low density.
- Lightweight: this allows significant weight reduction in the production of many products.
- Corrosion resistance: carbon fiber components are not susceptible to rust, unlike their metal counterparts.
- Higher fatigue life: longer than metals under repeated loading.
Carbon fiber is most often used as a reinforcement to make composite materials. Composites are versatile in their physical and chemical properties: materials are combined to attain a desired property, and the user has real choice over how the material behaves. Carbon fibers are frequently combined with PLA (polylactic acid) and ABS (acrylonitrile butadiene styrene) to improve the mechanical properties of those plastic bases.
The image above shows a toothed belt of the kind used in photocopiers, sewing machines and inside motorcycle engines. Traditionally these are made from rubber, which wears over time. Reinforced carbon fibers are a strong substitute, giving the belt strength without compromising its mechanical properties.
Is carbon fiber stronger than steel?
By weight, yes. Continuous carbon fiber in its fiber form is claimed to be five times stronger and one-third lighter than steel, and continuous carbon fiber composites weigh 25% to 60% less than steel or aluminum for comparable performance.
The distinction matters: steel has higher absolute strength in bulk, but carbon fiber has a far higher strength-to-weight ratio. For anything that moves (a vehicle, an aircraft, or a robot arm), that ratio is what governs performance, which is why the comparison is usually made by weight rather than by volume.
Why carbon fibers are replacing traditional materials
1. High strength-to-weight ratio
Compared with steel or aluminum, continuous carbon fiber composites weigh 25% to 60% less, and the strength and stiffness are not in doubt. In automotive applications especially, where vehicle weight is a primary focus, continuous carbon fibers help reduce it. Carbon fibers can also be formed into thin layered sheets, which improves strength compared with single-layered sheets.
High-end auto engineers use composites to decrease vehicle weight by as much as 60% while improving crash safety
3dfortify
2. Durability
Carbon fiber components are not susceptible to rust, unlike their metal counterparts. Regardless of weather, carbon fiber-infused materials tend to hold their shape through changing temperatures. Helicopter and turbine blades are made from carbon fiber-based material for exactly this reason: other materials demand replacement over a much shorter span.
3. Easy to design, prototype and manufacture
In 3D printing, material selection is crucial at the design stage. Continuous carbon fiber, being lightweight, is a go-to material for most manufacturers working to that goal, and its physical properties give designers real options. Prototyping and manufacturing take up a considerable share of production time; time-consuming layup processes were once the only way to achieve a given geometry. Digital composite manufacturing fast-tracks that considerably, enabling 3D printing to produce parts with the required strength and density.
When it comes to using carbon fiber, most industrial techniques struggle with cost and production time. Additive manufacturing techniques can incorporate carbon fibers in various forms, which is what changes that equation.
Chopped vs continuous carbon fiber
For 3D printing, carbon fiber can be used in two forms: chopped and continuous. The difference determines what the finished part can actually do.
| Chopped fiber | Continuous fiber | |
|---|---|---|
| Form | Short strands mixed into a base such as PLA or ABS | Unbroken strand laid into the part as it prints |
| Fiber orientation | Random: fills the matrix without orientation | Runs end to end, oriented in one direction |
| Load handling | Improved mechanical resistance and strength | Absorbs and distributes load across the entire length |
| Best for | Stiffer prototypes, light-duty parts | Structural, load-bearing parts |
Chopped fibers simply fill the material matrix without any orientation while continuous fibers run end to end being oriented in the same direction
3dprintingindustry.com
In continuous carbon fiber 3D printing, the thermoplastic extrudes and creates an infill, then the continuous fiber is laid into that infill, combining the carbon fiber with the thermoplastic. Printing proceeds layer by layer over several rounds of repetition. This is the process behind our own continuous fiber printing technology.
Continuous carbon fiber is used to produce bike frames, aircraft wings, automotive drive shafts, containers, propeller blades and car components. You can see some of our in-house carbon fiber products below.
Where do we use continuous carbon fibers in today’s world
Drone manufacturing
Carbon fiber materials are lightweight and high in strength, which is why they play a crucial role in drone manufacturing. Reduced weight lets drones fly greater distances with increased flight time, and improves energy utilisation and engine efficiency. Carbon fiber is used across drone frames, plates and tubes to achieve the lightness and rigidity that performance depends on.
An early illustration of the scale involved: Facebook's Aquila was a carbon fiber composite, solar-powered, four-propeller drone with a wingspan wider than a Boeing 737. Tested in 2016, it flew for 96 minutes at an altitude of 305 m, and the following year for 106 minutes at 914.4 m. It weighed 400 kg (less than a fifth of a Reaper drone), which was a direct result of building it in carbon fiber. Facebook ended the programme in 2018 and stopped building aircraft itself, but the weight figures remain a useful demonstration of what the material makes possible at that scale.
Aerospace
Anything that flies depends heavily on structural design and weight for performance, so airplanes and helicopters have considerable potential to incorporate continuous carbon fibers. Airliners including Airbus and Boeing use continuous carbon fiber extensively in passenger aircraft, and the same logic drives our own aerospace work.
The Air Force Research Laboratory delivered low-cost carbon fiber spars for a Low-Cost Attritable Aircraft wing assembly, using continuous fiber 3D printing (CF3D) technology to develop the lightweight assembly. The resulting structure achieved 160% of design limit load.
The successful work with Continuous Carbon fiber Composites and AFRL's focus on CF3D for this project not only advances new 3D printing technology but also offers the potential for aerospace-grade composite printing in high-performance industries.
John Scarcello, Senior Manager, Lockheed Martin Skunk Works
Automotive
Continuous carbon fiber materials are used frequently in high-end and luxury vehicles, improving fuel efficiency and speed. Car manufacturers such as BMW use carbon fiber chassis elements, and carbon fibers now appear in everything from body panels to structural components. The reduction in fuel consumption also helps control CO2 emissions and brings the carbon footprint down.
Components made of visible carbon, with the fabric structure that is so characteristic of this material, are visually fascinating. Fans of the high-tech material get their money's worth with BMW M Performance Parts
BMW.com
Beyond lightweight components, carbon fiber creates parts that resist corrosion, increasing the longevity of the vehicle. It also takes an excellent finish, which enhances the look and feel of the car.
Sports
A relatively new entrant to the carbon fiber world, sports manufacturers are not shying away from continuous carbon fibers for sporting goods. Lightweight, sturdy equipment is taking performance further across:
- Tennis and badminton: rackets and frames
- Golf: club handles
- Cycling: bike frames
- Skiing: stiff carbon fiberboard
- Skating: helmets and skates
- Water sports: canoes, kayaks, paddles
What has changed since
Continuous fiber printing has moved from demonstration into production in the years since this article was first written. The clearest shift is in aerospace, where the focus has moved from proving that printed composite structures work to qualifying and certifying them for flight.
The machines have moved too. When we first wrote this, continuous fiber printers were largely research equipment. Our own fabmachines range now includes the F-Series, India's first indigenous continuous fiber 3D printer, in production use rather than in development, and Indian Institute of Technology Madras runs a printing farm built on our machines.
What has not changed is the underlying argument. Weight still governs performance in anything that moves, carbon fiber still offers the best strength-to-weight ratio available at industrial scale, and continuous fiber still separates a part that looks right from a part that can carry a load. If anything, automated composite manufacturing has made that case more strongly than it could in 2021.
Conclusion
More industries are exploring how to improve design and product quality with continuous carbon fibers. Certain properties put the material ahead of traditional options like aluminum and steel, and manufacturers gain real versatility in selecting the chemical and physical properties they need. To summarise:
- Continuous carbon fiber is lightweight
- It has high strength and durability
- It offers high thermal and chemical resistance
- Its stiffness can replace heavy metals
The qualities of continuous carbon fibers cannot go unnoticed by manufacturers who want to deliver high-performance products. It is not ambitious to say that carbon fibers will continue to replace traditional materials across industries in the near future.
Have a part where weight is limiting what it can do? Talk to our team about carbon fiber.
Frequently Asked Questions
What is carbon fiber?
Thousands of carbon filaments, each 5 to 10 micrometres across, bundled into a tow and set into a resin. The result is stiffer and stronger by weight than steel, does not rust, and lasts far longer under repeated loading.
Is carbon fiber stronger than steel?
By weight, yes. In fiber form continuous carbon fiber is around five times stronger and one-third lighter than steel, and carbon fiber composites weigh 25% to 60% less than steel or aluminum for comparable performance. Steel has greater absolute strength in bulk, but carbon fiber has a far higher strength-to-weight ratio.
What is the difference between chopped and continuous carbon fiber?
Chopped fiber consists of short strands mixed into a base plastic such as PLA or ABS, which fills the matrix without orientation and improves stiffness. Continuous fiber is an unbroken strand laid into the part as it prints, running end to end in one direction, so it absorbs and distributes load along its whole length. Only continuous fiber produces genuinely structural parts.
What is carbon fiber used for?
Aircraft structures, drone frames and tubes, automotive body and chassis components, turbine and propeller blades, drive shafts, pressure vessels, and sports equipment including bike frames, rackets, kayaks and helmets.
How is continuous carbon fiber 3D printed?
The thermoplastic extrudes to create an infill, and continuous fiber is laid into that infill, combining the fiber with the thermoplastic. This process repeats layer by layer over several rounds to build the complete part.