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Best Carbon Fiber Filament

Carbon fiber makes a plastic stiffer and less prone to warping. It does not make it stronger, and in bench tests filled filament sometimes tests weaker than the plain resin. Buy it for dimensional stability on a material that warps, and budget for hardened nozzles.

Top pick

Nylon-CF

Nylon-CF, because nylon warps and creeps more than any base material here and the fiber fixes exactly that. Buy carbon fiber for stiffness and dimensional stability, never for strength: it does not add any.

Most dimensionally accurate PC-CF · Best value ABS-CF · Outdoors ASA-CF

As cited in

#	Material	Base warping	What the fiber changes	Nozzle	Strength gain	Sanding	Worth it
1	Nylon-CF the real case	High	Cuts warp and creep, the base material’s worst traits	Hardened steel minimum	None; stiffness only	Mask; the dust is the exposure	Yes
2	PC-CF most accurate	High	Cuts warp, improves dimensional accuracy	Hardened steel minimum	None; stiffness only	Mask; the dust is the exposure	Yes
3	ABS-CF best value	High	Cuts warp at a lower price than nylon or PC	Hardened steel minimum	None; stiffness only	Mask; the dust is the exposure	Yes
4	ASA-CF outdoors	Moderate	Cuts warp; the UV stability was already there	Hardened steel minimum	None; stiffness only	Mask; the dust is the exposure	Marginal
5	PETG-CF cosmetic	Low	Stiffness and a matte finish	Hardened steel minimum	None; stiffness only	Mask; the dust is the exposure	Marginal
6	PLA-CF a finish, not an upgrade	Low	A matte finish, essentially	Hardened steel minimum	None; stiffness only	Mask; the dust is the exposure	No

Compare

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Base warping
What the fiber changes
Nozzle
Strength gain
Sanding
Worth it