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Carbon Fiber FR

The backbone of flight-ready 3D printed composites

Carbon Fiber FR is a flame-retardant variant of Markforged’s unique, ultra-high-strength Continuous Carbon Fiber — when used to reinforce a Composite Base material like Onyx FR, it can yield parts as strong as 6061-T6 Aluminum. It’s extremely stiff and strong, and can be precisely laid down in a wide variety of geometries. Programmatically trace curved features, reinforce holes, and mimic unidirectional fiber layups — all within a few clicks.

Onyx FR-A and Carbon Fiber FR-A are purpose-built for the requirements of the aerospace, transportation and automotive industries. FR-A materials establish lot-level material traceability and pass the test suite necessary for qualification under 14 CFR 25.853 for most 3D-printable parts. Onyx FR-A and Carbon Fiber FR-A as printed on the Markforged X7 are undergoing qualification through the NCAMP process.


  • Cabin Components
  • Brackets & Mounts
  • MRO & Spare Parts
  • End-Use Parts
  • Functional Prototypes

Works with:

FX20™ X7™

Material Properties

Flexural Strength

Carbon Fiber Reinforced
Flexural Stiffness

Carbon Fiber Reinforced

Composite Base vs Reinforcement
Carbon Fiber FR is a continuous fiber reinforcement. It is laid down through a second nozzle on a Markforged composite printhead on the inside of parts. It cannot be printed by itself — instead, it’s used to reinforce parts printed out of a composite base material like Onyx FR. To learn about chopped vs continuous fibers:

Carbon Fiber FR : $175/50cc

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