Bambu Lab PET-CF Filament 1.75mm

$65.00

Carbon-fibre reinforced PET, with a soft satin glow rather than the dead matte of most fibre-filled materials. It is very stiff, very heat resistant, and — unusually for a material in this class — it barely absorbs water.

This is the one for load-bearing parts in a hot, humid environment. Bambu say so explicitly, and the numbers back it: water absorption 0.37% against the nylons' 0.88–2.56%, with heat deflection of 182°C. For Singapore, that combination is hard to beat.

It also runs on every Bambu Lab printer. Alone among the carbon-fibre engineering grades, Bambu list PET-CF as compatible with the whole range — no minimum chamber temperature to worry about.

Feed it from an external spool holder — the AMS series is not compatible. Use a hardened steel or high-flow nozzle, 0.6mm recommended. Bambu specifically advise against the 0.4mm high-flow nozzle. Plain brass or stainless will be destroyed by the carbon fibre.

At a glance

Density	1.29 g/cm³
Nozzle temp	260–290°C
Bed temp	80–100°C
Enclosure	Recommended — 45–60°C chamber
Print speed	Up to 100 mm/s
Nozzle	Hardened steel, 0.6mm recommended
Compatibility	AMS Lite AMS / AMS 2 Pro

Against the nylons

	PET-CF	PA6-CF	PAHT-CF
Water absorption	0.37%	2.35%	0.88%
Heat deflection	182°C	164°C	170°C
Stiffness, bending	5320 MPa	5460 MPa	4230 MPa
Tensile strength	74 MPa	102 MPa	92 MPa
Impact, notched	8.6 kJ/m²	13.4 kJ/m²	22.8 kJ/m²

PET-CF is the stiffest and most heat-resistant, and by far the least affected by humidity. It gives up tensile strength and toughness to get there — at 8.6 kJ/m² notched it is the most brittle of the four carbon-filled engineering materials we stock.

So: PET-CF for a rigid part that must stay dimensionally true in heat and damp. PAHT-CF if it also has to survive knocks. PA6-CF if raw strength matters most and you can guarantee dry.

Damp barely touches it

Bambu have published dry-versus-humid figures for their carbon-fibre grades, and PET-CF is almost unmoved: bending strength 131 → 127 MPa and stiffness 5320 → 5240 MPa, a loss of around 2%. PA6-CF loses 37% of its bending strength over the same test. If your parts live in Singapore's humidity, that gap matters more than any headline strength figure.

Worth knowing

Glue stick is required, and the Cool Plate SuperTack is not compatible.

Layer bonding is the weak axis. Bending strength falls from 131 MPa in plane to 49 across layers, and impact in Z is 4.5 kJ/m². Orient so load runs along the layers.

It shares PET's good manners — low warping and low shrinkage, so large flat parts behave better than they would in a nylon.

Use Support for PA/PET, specified by name.

Annealing: 80–140°C for 6 to 12 hours, the widest window in our range.

Storage

Bambu specifies under 20% RH, sealed with desiccant, and 80°C for 8–12 hours to dry. Less critical here than with the nylons, but still worth doing before a structural print.

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 or high-flow;
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
8 mm³/s max flow

Support materialSupport for PA/PET

Drying & storage

Drying80°C for 8–12 hours

HumidityUnder 20% RH, sealed

Water absorption0.37%

Annealing80–140°C for 6–12 hours

Thermal

Density1.29 g/cm³

Melting temperature250°C

Vicat softening226°C

Heat deflection182°C at 1.8 MPa
205°C at 0.45 MPa

Mechanical

Tensile strength (X–Y)74 ± 6 MPa

Young's modulus (X–Y)4730 ± 260 MPa

Bending strength (X–Y)131 ± 6 MPa dry
127 MPa when humid

Impact strength (X–Y)36.0 ± 2.7 kJ/m²
8.6 ± 0.5 notched

Figures from the Bambu Lab PET-CF technical data sheet v3.0, measured in the dry state, with nozzle, build-plate, compatibility and dry-versus-humid data from Bambu's carbon-fibre filament usage guide. Real-world results vary with printer, settings and model geometry.