Glass Fibre Filament

Glass fibre filament for brackets, jigs and enclosures that must stay stiff and hold their size, on PETG, ABS, ASA, PET, PA12 and PPA bases. Each grade comes in Black and Natural, and all of them print best on a hardened nozzle.

Glass fibre or carbon fibre filament?

Both reinforcements make a printed part stiffer, reduce warping and shrinkage, and help it hold its dimensions under load and heat. The differences decide which belongs in your part:

Stiffness: carbon fibre generally delivers more rigidity from the same base polymer, so choose CF when flex is the main enemy.
Impact: glass fibre tends to keep more toughness, which makes GF the safer bet for parts that get knocked, clamped or dropped.
Colour: all six GF grades come in Black and Natural. Natural is easy to inspect, paint or post-process, while most of our carbon fibre filament grades are black only.
Cost: glass is the more economical reinforcement, which is why PPA-GF is positioned as a cost effective, heavy duty alternative to carbon fibre composites.
Electrical: glass is non-conductive, whereas carbon fibre conducts electricity, so GF is the natural pick for housings and brackets around electronics.

Comparing the six GF filaments

Filament	Nozzle / bed	Drying	Best for
PETG-GF	230-260°C / 70-90°C	70°C, 5+ hours	Tool holders, jigs and workshop organisers
ABS-GF	220-240°C / 100-110°C	80°C, 5 hours	Automotive fixtures and accurate prototypes
ASA-GF	240-260°C / 100-120°C	80°C, 5+ hours	Outdoor enclosures and brackets (HDT 88°C)
PET-GF	See product page	See product page	Stiffer, more stable parts than standard PETG
PA12-GF	See product page	See product page	Tough nylon housings, tooling and fixtures
PPA-GF	See product page	See product page	Load bearing parts facing high heat and chemicals

Our product data does not include print settings for PET-GF, PA12-GF or PPA-GF, or an HDT for any GF grade except ASA-GF, so check each product page before printing rather than guessing.

Which GF grade suits which job

Everyday functional parts: PETG-GF

PETG-GF is the entry point, with more rigidity and temperature tolerance than standard PETG. Use it for tool holders, brackets and garage organisers that carry weight without flexing.

Heat and weather: ABS-GF and ASA-GF

Both perform best in an enclosed printer with a 100°C plus bed, in a well ventilated room. ASA-GF adds UV protection for parts that live outdoors, from garden tools to pipe brackets, while ABS-GF suits fixtures and housings that must stay accurate through temperature swings.

Engineering duty: PET-GF, PA12-GF and PPA-GF

PET-GF produces stronger, more stable parts than standard PETG while staying easier to print than many advanced materials. PA12-GF combines nylon's toughness and chemical resistance with glass fibre rigidity, and PPA-GF is the ultra rigid choice for heavy loads, high heat and harsh chemicals.

Printing glass fibre filament: nozzle and drying

Glass fibre is abrasive and can quickly wear a brass nozzle, so print every GF grade on a hardened steel nozzle (PPA-GF also lists ruby as an option). Dry PETG-GF at 70°C and ABS-GF and ASA-GF at 80°C, for 5 hours each. PA12-GF and PPA-GF are nylon family materials, and PPA-GF is highly hygroscopic, so dry them thoroughly and feed from a heated dry box on long prints. Read more in How to Store Filament in Australia's Humidity.

Buying GF filament from OzFDM

Every glass fibre grade is a 1kg roll of 1.75mm filament, shipped from our Perth and Melbourne warehouses. GF rolls count towards volume pricing alongside any other 1kg roll: 5% off 3 or more, 10% off 6 or more, 15% off 12 or more, and 20% off a full carton of 12 in one colour and material.

Glass fibre filament FAQs

Is glass fibre filament stronger than carbon fibre?

It depends on the property. Carbon fibre generally gives more stiffness, while glass fibre tends to keep more impact toughness. Comparing the same base polymer is the fairest test: ASA-GF and ASA-CF both list an 88°C HDT and near identical tensile strength (40.8-41.3 MPa against 39-42 MPa). With heat and strength that close, choose on stiffness, toughness, colour and cost.

Do I need a hardened nozzle for glass fibre filament?

Yes. Glass fibres are hard and abrasive, and a brass nozzle will wear until extrusion becomes inconsistent. Fit a hardened steel nozzle for all six GF grades. A 0.6mm nozzle gives fibres more room and is less likely to clog on long prints, while 0.4mm suits detailed parts. Our hardened nozzle comparison helps you choose one.

Can I print glass fibre filament through an AMS?

It depends on the grade. PETG-GF is listed as fully compatible with AMS systems. ABS-GF and ASA-GF can be used if the spool fits, though manual loading gives a more consistent feed. PET-GF should not be assumed compatible, and AMS Lite is generally not recommended for it. PPA-GF is not recommended for standard AMS units, and PA12-GF is best fed from a dry box.

Why use glass fibre for electronics enclosures?

Because glass does not conduct electricity, a GF part does not add conductive fibres around circuit boards, terminals or wiring. PETG-GF is a practical choice for indoor enclosures, and ASA-GF for anything mounted outdoors. Treat this as a sensible design preference rather than an electrical rating, and test parts properly for any use where electrical safety matters.

What is the difference between PET-GF and PETG-GF?

PETG-GF is the easier of the two, with published settings of 230-260°C on a 70-90°C bed and full AMS compatibility listed on its product page. PET-GF uses PET without the glycol modification found in PETG, and produces stronger, more stable parts with better resistance to deformation than standard PETG materials. Check the PET-GF product page for its current settings before printing.