Bambu Lab PA6-CF Filament 1.75mm

$65.00

Carbon-fibre reinforced Nylon 6. Tensile strength of 102 MPa and bending strength of 151 MPa put it well beyond PETG or ABS — this is for fixtures, clamps, automotive brackets and structural parts that would otherwise be machined from metal. It holds its shape to 164°C under load.

Feed it from an external spool holder — the AMS series is not compatible with this filament. It also needs an enclosed printer with a 45–60°C chamber, which rules out the open-frame A-series, and a hardened steel nozzle, 0.6mm recommended. 0.2mm is not supported and the 0.4mm high-flow nozzle is not advised. Do not use a brass or plain stainless nozzle.

At a glance

Density	1.09 g/cm³
Nozzle temp	260–290°C
Bed temp	80–100°C
Enclosure	Required — 45–60°C chamber
Print speed	Up to 100 mm/s
Nozzle	Hardened steel, 0.6mm recommended
Compatibility	AMS Lite AMS / AMS 2 Pro

Where it sits in the range

	PA6-CF	PC	PETG Basic
Tensile strength	102 MPa	62 MPa	51 MPa
Bending strength	151 MPa	108 MPa	75 MPa
Stiffness	4430 MPa	2110 MPa	2780 MPa
Heat deflection	164°C	117°C	68°C

It is also tougher than any of them on the notched figure, at 13.4 kJ/m² — so unlike most stiff materials, it doesn't buy rigidity with brittleness.

The catch: moisture, and it is measurable

Bambu have published what damp PA6-CF actually costs you, and it is the largest drop of any of their carbon-fibre filaments:

Bending strength 151 → 95 MPa (down 37%)
Stiffness 5460 → 3560 MPa (down 35%)

By comparison PPA-CF loses about 3% and PPS-CF loses nothing at all. A wet spool of PA6-CF is not a slightly worse spool — it is a different material.

Water absorption is 2.35%, around ten times PC's. Nylon pulls moisture out of the air continuously, and Singapore's humidity makes this worse than almost anywhere. Dry the filament immediately before printing (80°C for 8–12 hours), feed it from a sealed dry box, and consider sealing or coating finished parts that will live somewhere damp.

If you can't keep it dry, PAHT-CF or PET-CF will give you far more predictable results — both are formulated to hold their properties when humid.

Printing it well

Glue stick is required. Use a high-temperature plate — Engineering, High Temperature or Textured PEI. The Cool Plate SuperTack is not compatible.

Use Support for PA/PET. Bambu specify that support material by name for this filament — ordinary supports won't release cleanly at these temperatures.

Layer direction matters a lot. Tensile falls from 102 MPa in plane to 48 across layers, and bending from 151 to 80. Orient so load runs along the layers.

Annealing is endorsed and effective: 80–130°C for 6 to 12 hours. Test on a sample first.

Print slowly — 100 mm/s is the ceiling, well below most materials.

Bambu's usage guide for the carbon-fibre grades covers feeding, drying and the dry-versus-humid data in full: PET-CF / PPA-CF / PPS-CF / PA6-CF Usage Guide

Full specifications

Printing

Nozzle temperature260–290°C

Nozzle size0.6 mm recommended
hardened steel; not 0.2 mm;
0.4 mm high-flow not advised

Bed temperature80–100°C

Chamber temperature45–60°C

Build plateGlue stick required
Cool Plate SuperTack

Print speedUp to 100 mm/s

Support materialSupport for PA/PET

Drying & storage

Drying80°C for 8–12 hours

HumidityUnder 20% RH, sealed

Water absorption2.35%

Annealing80–130°C for 6–12 hours

Thermal

Density1.09 g/cm³

Melting temperature223°C

Vicat softening212°C

Heat deflection164°C at 1.8 MPa
186°C at 0.45 MPa

Mechanical

Tensile strength (X–Y)102 ± 7 MPa

Young's modulus (X–Y)4430 ± 310 MPa

Bending strength (X–Y)151 ± 8 MPa dry
95 MPa when humid

Impact strength (X–Y)40.3 ± 2.5 kJ/m²
13.4 ± 1.7 notched

Figures from the Bambu Lab PA6-CF technical data sheet v3.0, measured on dry specimens, with nozzle, build-plate, compatibility and dry-versus-humid data from Bambu's carbon-fibre filament usage guide. Nylon absorbs moisture readily and wet parts perform well below the dry figures.