3DXTech FibreX — Glass-Fiber Reinforced Filament
FibreX is 3DXTech’s glass-fiber reinforced line — high stiffness like carbon fiber, but with more impact toughness, better elongation and, unlike carbon fiber, electrical insulation (GF is non-conductive). The range runs from Nylon 12+GF30 for wear and fatigue, through Obsidian Nylon 6+GF, to high-temp PEI/ULTEM+GF30 and PEEK+GF20 for aerospace and metal-replacement — plus FibreX ABS+GF in pellets for large-format printing. All 1.75 mm filament (except the pellets), made in the USA. This page compares the grades so you can match the polymer and the reinforcement to your part.
- Up to 8,790 MPa stiff
- Tough & impact-resistant
- Electrically insulating
- US stock
Choosing a 3DXTech fibrex machine
The decisions that actually matter for this class of machine — size them to your parts, not to a spec sheet.
Glass vs carbon fiber
Glass fiber adds stiffness and dimensional stability like CF but keeps more impact toughness and elongation, costs less, and stays electrically insulating — so choose GF for tough, load-bearing or non-conductive parts, and CarbonX when you need maximum rigidity and the lightest weight.
Match the polymer
Pick the base for the environment: Nylon 12+GF30 for wear, fatigue and low moisture uptake; Obsidian Nylon 6+GF for tough engineering parts; PEI/ULTEM+GF30 and PEEK+GF20 for the highest temperatures and aerospace service.
Stiffness & strength
FibreX runs from ~4,600 MPa (Obsidian PA6+GF) to ~8,790 MPa (PEI+GF30), with the PEI grade also the strongest at 145 MPa tensile — size the grade to the load and rigidity your part needs.
Hardware
Glass fiber is abrasive, so a hardened/wear-resistant nozzle is required. The PEI and PEEK grades also need a high-temp printer with a heated chamber; we confirm compatibility before you buy.
Compare the fibrex lineup
| Specification | Nylon 12+GF30 | Obsidian PA6+GF | PEI+GF30 | PEEK+GF20 |
|---|---|---|---|---|
| Base polymer | Nylon 12 (PA12) | Nylon 6 (PA6) | PEI — SABIC ULTEM | PEEK |
| Glass fiber | 30% | Glass-filled | 30% | 20% |
| Tensile strength | 82 MPa | 85 MPa | 145 MPa | 105 MPa |
| Tensile modulus (stiffness) | 7,800 MPa | 4,600 MPa | 8,790 MPa | 7,250 MPa |
| Heat resistance | High (PA12) | 176 °C HDT | 212 °C HDT (Tg 217 °C) | ~250 °C |
| Best for | Wear & fatigue | Tough engineering | Aerospace high-temp | Metal replacement |
| Price (from) | $107.80 | $143.00 | $137.50 | $247.50 |
Specs as published on each Rev1 product page / 3DXTech TDS. All glass-fiber reinforced, 1.75 mm, require a hardened nozzle. FibreX ABS+GF (listed below) is a pellet product for large-format/pellet printers.
3DXTech FibreX printers we sell & support
Built for the work you already do
Frequently asked questions
Glass fiber or carbon fiber — which should I choose?
Glass fiber (FibreX) and carbon fiber (CarbonX) both add stiffness and dimensional stability. Choose FibreX when you want more impact toughness and elongation, a lower cost, or electrical insulation (glass fiber is non-conductive). Choose CarbonX for maximum rigidity and the lightest weight. Tell us the part and we’ll recommend.
Which FibreX grade is right for me?
Match the base polymer to the environment: Nylon 12+GF30 for wear and fatigue, Obsidian Nylon 6+GF for tough engineering parts, PEI/ULTEM+GF30 for aerospace high-temp and the highest stiffness, and PEEK+GF20 for the ultimate heat and chemical resistance.
Do I need a special nozzle?
Yes — glass fiber abrades a standard brass nozzle, so a hardened or wear-resistant nozzle is required for every FibreX grade. The PEI and PEEK grades also need a high-temp printer with a heated chamber.
Is glass-fiber filament electrically conductive?
No — glass fiber is an insulator, so FibreX grades stay electrically insulating. That’s a key advantage over carbon-fiber grades for electrical and electronics parts where you don’t want conductivity.
Are these made in the US and in stock?
Yes — 3DXTech FibreX materials are made in the USA and ship from US stock. Rev1 is an authorized 3DXTech reseller with US-based application and printer support. Call (248) 707-2950.
Can’t find your answer? Browse the support knowledge base for setup, calibration and troubleshooting guides, or open a support ticket.
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