Carbon Fibre Additive Manufacturing Providers
Carbon fibre reinforced polymers — both chopped and continuous fibre — enable 3D-printed parts with stiffness and strength rivalling aluminium at a fraction of the weight. Short-fibre composites enhance nylon and PEEK filaments, while continuous fibre processes embed unidirectional carbon, fibreglass, or Kevlar for load-bearing structures. Browse verified carbon fibre AM providers on ForgedLink, screened for fibre layup accuracy, mechanical testing, and integration with jig, fixture, and tooling workflows.
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How AM carbon fibre bridges the gap between polymers and metals
AM carbon fibre sits between standard engineering polymers and metals on the performance ladder — and in two very different ways. Short-fibre composites (chopped carbon fibre blended into nylon, PEEK, or PLA filament) boost stiffness and tensile strength by 30–60% over the base polymer and improve surface finish and thermal resistance. Continuous fibre processes (Markforged Continuous Fibre Fabrication, Anisoprint CFC, Arevo robotic layup) embed unidirectional carbon fibre tows co-extruded with the matrix polymer to deliver aluminium-class specific stiffness — tensile modulus >60 GPa, specific strength exceeding aerospace aluminium — at a fraction of the density.
The distinction is critical when specifying: short-fibre CF is widely available, inexpensive, and suitable for stiffened prototypes and production parts where moderate stiffness uplift is valuable. Continuous-fibre CF is available from a smaller pool of specialist providers, costs more, and is engineering-justified only when you genuinely need the load-bearing performance — jigs and fixtures carrying real load, UAV structural frames, lightweight brackets for aerospace or automotive. The dominant production use case for continuous-fibre AM is tooling: jigs, fixtures, and drill templates where CF composites weigh 40–60% less than aluminium equivalents and can be iterated in hours rather than days.
Where AM carbon fibre parts are used in production
Jigs, fixtures, and CMM inspection tooling
By far the largest volume CF AM application. Continuous-fibre CF jigs replace aluminium equivalents at 40–60% weight saving, with dimensional stability adequate for assembly and inspection tasks. Markforged, Anisoprint, and Stratasys CF-PA providers serve this market at scale.
UAV and drone structural frames
Lightweight CF composite frames, motor mounts, and arm assemblies for commercial UAV platforms — AM enables rapid design iteration and custom geometry production at volumes too low for autoclave prepreg layup to be economic.
Aerospace non-structural brackets and clips
CF-PA or CF-PEEK brackets and support structures meeting FAR 25.853 FST requirements in commercial aircraft interiors — weight advantage over metal fittings justified for secondary structure with moderate load paths.
Motorsport aerodynamic and powertrain components
Short-fibre CF-PA and CF-PEEK for rapid-iteration body aero elements, brackets, and sensor mounts in racing applications where iteration speed beats the mechanical case for hand-laid carbon prepreg.
Robotics end-effectors and collaborative robot tooling
Lightweight CF composite end-of-arm tooling (EOAT) for collaborative robots where every gram of tool inertia matters for payload capacity and cycle time — CF AM tooling runs 50–70% lighter than equivalent aluminium machined EOAT.
Medical device housings and equipment brackets
CF-PEEK and CF-nylon enclosures for diagnostic and surgical equipment where ESD dissipation, chemical resistance, and low weight are required — continuous CF grades also meet the radiolucency requirement for MRI-compatible equipment brackets.
Common AM carbon fibre composite forms
Chopped CF + Nylon (Markforged Onyx, Stratasys CF-PA)
The default entry point for CF AM. ~20% chopped carbon fibre by volume in PA12 matrix. Tensile strength ~70–80 MPa (vs ~50 MPa for unfilled nylon), modulus ~7–9 GPa. Standard for stiffened functional parts, enclosures, and moderate-load brackets. Available on standard FDM platforms; very wide provider base.
Continuous Carbon Fibre (Markforged CFF)
Unidirectional CF tows co-extruded with Onyx matrix in Markforged CFF machines. Tensile modulus >60 GPa in the fibre direction, tensile strength >600 MPa — aluminium-class performance. For load-bearing structural applications. Available only on Markforged-platform providers.
Continuous Carbon Fibre (Anisoprint CFC)
Anisoprint's Composite Fiber Co-extrusion embeds CF tows in standard FDM polymers (PA, PC, PETG). Modulus 50–70 GPa in-plane. Platform-agnostic approach that can integrate CF into more material matrices than Markforged's closed system.
Chopped CF + PEEK (PEEK-CF30)
Carbon-filled PEEK with 30% chopped CF by weight. Tensile modulus ~20 GPa, continuous use >250°C, ESD-dissipative. The high-performance CF composite for aerospace and semiconductor applications where temperature and chemical resistance matter.
Continuous Fibreglass (Markforged FG)
Continuous fibreglass tow in Onyx matrix — lower stiffness than CF (~21 GPa) but more impact-resistant, translucent, and substantially cheaper. For tooling and structural parts where the maximum CF stiffness is not needed.
Continuous Kevlar (Markforged Kevlar)
Aramid fibre tow in Onyx matrix — lower stiffness (~27 GPa) but highest toughness and vibration-damping in the continuous fibre family. Used for impact-resistant enclosures, drone frames, and parts requiring energy absorption.
When to choose AM carbon fibre over aluminium, standard nylon, or hand-laid CF
Continuous CF AM vs CNC aluminium for tooling: continuous CF AM wins on speed (hours vs days), weight (40–60% saving), and iteration cost. Aluminium wins on absolute dimensional stability, surface hardness, and thermal conductivity (relevant for heated jig applications). For most jig and fixture applications under ~500 N load, continuous CF AM delivers adequate performance in a fraction of the lead time.
Short-fibre CF vs unfilled nylon: short-fibre CF gives meaningful stiffness and surface finish improvements over unfilled PA12 at minimal cost premium. Default to short-fibre CF (Onyx or equivalent) whenever a nylon part is functional — the stiffness uplift is almost always worth it. The trade-off is brittleness: short-fibre CF is less tough than unfilled nylon and snaps rather than deforming under sudden overload.
AM continuous CF vs hand-laid carbon prepreg: AM continuous CF wins on speed and geometric freedom but loses on absolute mechanical properties (autoclave prepreg achieves 50–60 GPa in-plane modulus at ~60% Vf; AM continuous CF is 60–70 GPa but at ~35% Vf). For volumes under ~20 units of geometrically complex parts, AM is often faster and cheaper. For high-volume, precision-load-path parts, prepreg layup gives better properties.
PEEK-CF30 vs aluminium for aerospace brackets: PEEK-CF30 wins on specific stiffness (~14 GPa·cm³/g vs ~27 GPa·cm³/g for 6061-T6), chemical resistance, and FST compliance. Aluminium wins on absolute stiffness per euro, machinability, and the existing qualification database. For secondary structure in FST-critical environments, PEEK-CF30 is the material of choice; for primary structure, aluminium retains the qualification depth advantage.
Cost and lead time for AM carbon fibre parts
Short-fibre CF FDM parts (Onyx / CF-PA) deliver in 1–5 days from most providers — they run on standard FDM platforms with near-zero provider qualification overhead. Continuous CF parts from Markforged or Anisoprint providers deliver in 3–10 days with simple post-processing. Specialist applications (PEEK-CF30 in heated-chamber FDM, medical-grade CF composites with material certification) run 2–4 weeks.
Indicative pricing for a 100 cm³ chopped-CF nylon (Onyx) FDM part: £80–£200 / €95–€237 — the most cost-accessible AM CF route. Continuous-fibre CF parts run £150–£500 / €178–€590 depending on fibre volume fraction and part geometry. PEEK-CF30 on specialist FDM: £400–£900 / €475–€1,065. The economic advantage over CNC aluminium emerges at low volumes (1–10 units) and complex geometry — at higher volumes, machined aluminium often recovers the cost gap.
Related processes & materials
Frequently asked questions
What's the difference between chopped and continuous carbon fibre in AM?
Chopped (short) fibre is randomly oriented 50–150 µm chopped carbon fibre strands blended into the filament matrix. It boosts stiffness and strength modestly (30–60% over base polymer) and improves surface finish. Continuous fibre embeds full-length unidirectional carbon fibre tows that run through the entire cross-section of the part in specified orientations — this delivers 10–20× the stiffness of short-fibre composites and puts AM CF into the aluminium-class performance range. Continuous fibre requires specialist platforms (Markforged, Anisoprint) and skilled fibre path design.
Is AM carbon fibre strong enough for structural aerospace use?
Continuous-fibre AM CF (Markforged CFF or Anisoprint) is used for non-structural aerospace brackets and secondary structure, including flight-tested applications. The mechanical properties (>60 GPa modulus, >600 MPa tensile strength in-plane) are within the range of structural aerospace requirement for many secondary-structure applications. However, the fatigue characterisation database, qualification depth, and traceability documentation for AM CF are far thinner than for metallic options under AS9100 flows. For primary structure under certification, metals with established AMS specifications are still the default.
Can AM carbon fibre be used for electrical grounding and ESD applications?
Yes — carbon fibre is electrically conductive (~1,500 S/m for the fibre itself). Chopped-CF composites (Onyx, CF-PA) are typically ESD-dissipative (surface resistivity 10⁶–10⁸ Ω/sq), suitable for anti-static tooling, trays, and electronics handling fixtures. PEEK-CF30 is specifically used for semiconductor wafer-handling components where ESD control and chemical resistance are both required. Confirm the exact resistivity range with the provider — the matrix-to-fibre ratio affects the conductivity level.
Why can't I use standard AM CF for hydraulic or pressure-bearing applications?
Continuous-fibre AM CF has excellent in-plane properties but poor through-thickness (Z-axis) strength — the inter-layer bond is the weak link. Internal pressure paths rely on through-thickness tensile and shear strength, which in AM CF is essentially just the matrix polymer strength (~50–70 MPa for nylon) with minimal fibre contribution. For pressure vessels and fluid-handling parts, machined aluminium or AM metals are the correct choice. Use AM CF for structural parts where the load path is primarily in-plane.
How do I specify AM carbon fibre for a jig or fixture application?
Start with the load case: what is the maximum clamping or assembly force, and where does it act? A structural simulation (even simplified hand calculation) tells you whether short-fibre CF (adequate for most light-duty tooling) or continuous CF (needed for heavier clamps and drill bushings) is required. Then specify: (1) material — Onyx or Anisoprint CF matrix; (2) fibre routing — concentric or isotropic fill for general tooling; (3) post-processing — smooth sealing coat if dimensional critical faces need sub-0.1 mm accuracy; (4) datum features — specify machined insert locations for locating pins and tooling balls.