Carbon Fiber Filament

Our stiffest, strongest fiber with the highest strength-to-weight ratio.

12.5 kg (27.5) lb) hung from both a 7 g carbon-fiber-reinforced Onyx sample (left) and a 12 g aluminum sample (right)


Flexural strength

In three-point bending, our 3D printed carbon fiber is 8x stronger than ABS and 20% stronger than the yield strength of aluminum.

32 (MPa)
58 (MPa)
84 (MPa)
Caron Fiber
470 (MPa)


Flexural stiffness

3D printed carbon fiber is 25x more rigid than ABS and 2x more rigid than the rest of Markforged’s reinforcement fibers.

0,84 (GPa)
2,1 (GPa)
2,89 (GPa)
Caron Fiber
51 (GPa)


Strength to weight

Compared to 6061 aluminum, 3D printed carbon fiber has a 50% higher strength-to-weight ratio in flexure and 300% higher in tension.

29 (N⋅m/kg)
58 (N⋅m/kg)
64 (N⋅m/kg)
6061 Aluminum
224 (N⋅m/kg)
Caron Fiber
336 (N⋅m/kg)


When To 3D Print With Carbon Fiber

Carbon fiber material is strong enough to replace aluminum at half the weight; use it when you want superior stiffness and minimal deflection.

  • Robotic arms
  • Inspection fixtures
  • Forming tools
  • End use parts


What is carbon fiber?

Carbon fiber is a thin filament made up of carbon atoms organized into a crystalline structure. Because of its very high stiffness and strength it is widely used in the aerospace and automotive industries.

How strong is carbon fiber?

Carbon fiber has a flexural strength of 470 MPa (68 ksi) which is 20% higher than the yield strength of 6061 aluminum. Its tensile strength is 700 MPa (102 ksi), more than twice the ultimate tensile strength of aluminum. To learn more about carbon fiber material properties, check out the data sheet.