CF-Nylon is chopped carbon fiber embedded in a nylon matrix. The carbon fiber dramatically increases stiffness — parts that would flex in plain nylon are rigid in CF-Nylon — while keeping most of nylon’s toughness and wear resistance. Dimensional stability is significantly better than unfilled nylon, which means parts maintain their shape and size more reliably. The price: hardened steel nozzle required, moisture handling is critical, and printing is unforgiving.
Where CF-Nylon Makes Sense
Structural brackets that need to be stiff and light. Drone and RC aircraft frames where weight matters. Industrial jigs and fixtures that see dynamic loads. Parts requiring both stiffness and toughness — pure carbon fiber composites are stiffer but brittle; CF-Nylon keeps ductility. Any application where plain nylon would flex too much.
Where to Use Something Else
If you need rigidity but not toughness: PLA-CF or PETG-CF are easier to print. If you need maximum impact resistance without stiffness: unfilled nylon or TPU. If the part doesn’t go above 80°C: PETG-CF handles similar loads and is far easier to print without the moisture management burden.
Hardened Steel Nozzle — Non-Negotiable
Carbon fiber is abrasive enough to wear a standard 0.4mm brass nozzle to 0.6mm+ within a single 500g spool. The nozzle orifice enlarges, layer width becomes inconsistent, and flow calibration drifts constantly. Use a hardened steel nozzle. Ruby-tipped nozzles last longer but hardened steel is sufficient and cheaper. Recommended minimum nozzle diameter: 0.4mm, though 0.6mm reduces clogging risk.
Moisture: Identical to Nylon
CF-Nylon absorbs moisture at the same rate as unfilled nylon. Dry at 70–80°C for 8–12 hours before printing. Use a dry box feeding the filament directly to the printer — the fiber content doesn’t change moisture absorption behavior. Wet CF-Nylon prints rough, has poor layer adhesion, and voids from steam bubbles undermine the stiffness advantage.
Temperature
Nozzle: 260–270°C for most CF-Nylon brands. Start at 265°C. Layer adhesion fails below 255°C; above 280°C you risk degrading the nylon matrix.
Bed: 85–95°C. Garolite (G10) is the best bed surface for nylon and CF-Nylon — adhesion is consistent and release is clean. PEI with PVA glue stick works. Bare PEI has marginal adhesion. Add a 10mm brim on any part with corners.
Enclosure
Required. Chamber temperature of 50–60°C prevents the delamination cracking that appears in CF-Nylon at the same heights where plain nylon would crack. The enclosure also slows moisture reabsorption during printing.
Carbon Fiber Dust
CF-Nylon produces airborne carbon fiber dust during printing and post-processing (sanding, cutting). Carbon fiber particles are a respiratory irritant. Print in a ventilated space or use a printer with a HEPA filter. Wear a mask when sanding or machining CF parts.