Filament library
Carbon Fiber Blends print settings
Stiff, matte, dimensionally beautiful — and hungry for your brass nozzle.
Carbon-fiber filaments (PLA-CF, PETG-CF, PA-CF) are base materials with chopped carbon fibers mixed in. The fibers add stiffness, kill warping and shrinkage, and produce that gorgeous matte, machined-looking surface — which is why CF blends have become the enthusiast default for functional and visible parts alike.
Two truths to know before buying: the fibers are abrasive and will destroy a brass nozzle in a spool or two — hardened steel is mandatory — and 'carbon fiber' doesn't mean 'unbreakable'. CF parts are stiffer but often more brittle than the plain base material. The base polymer still decides temperature and weather behavior.
Difficulty
Moderate
Best for
Drone and RC parts, brackets, enclosures, anything wanting stiffness and a premium matte look.
Skip it for
Printers with brass nozzles, flexible parts, load cases needing impact toughness over stiffness.
Starting settings
Drying
Base material's temp for Base material's time — CF blends inherit the base polymer's thirst — PA-CF needs nylon-grade drying discipline, PLA-CF barely any.
New to drying? Read how to dry filament first.
Bed adhesion
Generally easier than the base material — the fibers reduce shrinkage, so CF parts warp less and corners stay down. Standard surfaces for the base polymer work.
Mistakes to skip
- • Printing CF through a brass nozzle and discovering it's oval a month later — the fibers sand it away from inside.
- • Expecting impact toughness: CF adds stiffness, and often subtracts ductility. Drop tests favor plain PETG.
- • Ignoring the base material — PLA-CF still melts in a car, no matter how technical it looks.
Common questions
Will carbon fiber filament damage my printer?
Only the nozzle, and only if it's brass. Chopped fibers are abrasive and wear brass from the inside within one or two spools; a hardened steel nozzle solves it permanently. Extruder gears and the rest of the machine don't care.
Is PETG-CF stronger than PETG?
Stiffer, noticeably — parts flex less and hold shape under load. But pure tensile and impact strength often drop slightly, because fibers interrupt the plastic's continuity. Choose CF for rigidity, dimensional accuracy, and looks; choose plain PETG for parts that must absorb hits.
Which carbon fiber filament should I start with?
PETG-CF: forgiving base material, meaningful stiffness gain, beautiful matte finish, no enclosure needed. PLA-CF looks equally good but keeps PLA's heat weakness; PA-CF is the performance king with nylon's drying demands attached.
Not sure Carbon Fiber Blends is the right call for your project? TheFilament Pickerdecides in five questions — and thecost calculatortells you what each print costs.