Reinforced · Carbon & Glass Fiber
Chopped fiber for parts that can't be allowed to bend.
Reinforced filaments blend chopped carbon or glass fiber into a base polymer — PLA, PETG, ABS/ASA, nylon, or high-temperature PPS — to push stiffness and dimensional stability well past what the unreinforced material can do. They're the choice for jigs, drone frames, tooling, and structural brackets where the part has to stay exactly the shape it was printed, under load, indefinitely.
CF and GF wear out soft parts
Carbon and glass fibre grind down stainless nozzles and soft extruder gears. Run them through a hardened hotend and hardened gears like the Panda Claw set.
See Panda Claw gears →Starting points, not gospel — always check the specific spool's spec sheet or your slicer's built-in profile first.
PLA-CF prints close to plain PLA; nylon-based blends are the hardest here. Nozzle wear needs managing either way.
The stiffest, most dimensionally stable material on this list.
Depends on the base — PA-CF/GF tops this list, while PLA-CF stays near plain PLA.
Stiff by design, and more brittle than its unreinforced base.
Excellent under sustained load; less impact-tolerant than a flexible material.
Fiber reinforcement doesn't change what the base plastic is chemically — it adds short chopped strands of carbon or glass fiber to the pellets before the filament is extruded, the same way fiberglass reinforces resin. Carbon fiber gives the stiffest, lightest result with a matte, slightly rough finish; glass fiber is usually cheaper, a little less brittle, and often has a subtle translucent fleck to it.
The fiber content is what makes these filaments both useful and demanding: it dramatically reduces warping and sag for its heat class, but it's also abrasive enough to grind through a standard brass nozzle in a matter of hours. A hardened-steel or otherwise wear-resistant nozzle isn't optional here — it's the difference between one spool and a worn-out flow path.
Because reinforced blends are built on PLA, PETG, ABS/ASA, nylon, or high-temperature polymers like PPS, whatever moisture-sensitivity and bed-prep quirks that base material has — nylon's especially — carry over. Check which base polymer a given reinforced spool uses before assuming its print settings.
Yes. Chopped fiber is abrasive enough to wear through a standard brass nozzle in hours — use a hardened-steel nozzle, 0.4 mm or larger. Bambu Lab lists 0.2 mm nozzles as not compatible with CF/GF filaments.
Carbon fiber is stiffer and lighter with a matte finish; glass fiber is usually cheaper and a bit less brittle. Neither is strictly better — carbon for weight-critical stiffness, glass fiber for a tougher, less brittle part.
Fiber-reinforced filaments are more brittle than their unreinforced base. If a part needs to flex or absorb shock, use the plain base polymer (or TPU) instead of reinforced.
Whatever the base polymer needs — check which one (nylon, PETG, etc.) the specific spool is built on, since that determines nozzle/bed temp and drying requirements, not the fiber content.
