GF-Nylon is glass fiber-reinforced nylon. Glass fiber increases stiffness and heat resistance significantly — parts can handle sustained temperatures up to 150–180°C depending on grade, well above any other common consumer filament. It’s heavier than CF-Nylon but cheaper, and the glass fiber reinforcement improves heat deflection temperature more than carbon fiber does relative to cost.
Where GF-Nylon Makes Sense
Underhood automotive applications where parts see sustained heat above 100°C. Industrial fixtures used near heat sources. Structural components where heat resistance matters more than weight. Cases where CF-Nylon’s cost isn’t justified and the application needs heat resistance above what ASA or ABS can provide.
GF-Nylon vs. CF-Nylon
| Property | GF-Nylon | CF-Nylon |
|---|---|---|
| Stiffness | High | Higher |
| Heat resistance | ~150–180°C | ~130°C |
| Weight | Heavier (density 1.35) | Lighter (density 1.15) |
| Cost | Lower | Higher |
| Abrasiveness | High | High |
Use GF-Nylon when heat resistance is the priority. Use CF-Nylon when stiffness-to-weight ratio is the priority.
Hardened Steel Nozzle Required
Glass fiber is as abrasive as carbon fiber. A brass nozzle will wear out in the first spool. Use hardened steel, minimum 0.4mm diameter. The higher density of GF-Nylon (1.35 vs 1.15 for CF) means slightly more material per volume and slightly higher back-pressure at the same speed.
Moisture: Same as Any Nylon
Dry at 70–80°C for 8–12 hours. Use a dry box during printing. Wet GF-Nylon causes the same problems as wet unfilled nylon: bubbling, rough surface, weak layer adhesion. The glass fiber doesn’t change moisture absorption characteristics.
Temperature
Nozzle: 260–275°C. GF-Nylon often needs slightly higher temperatures than CF-Nylon because the glass fiber has lower thermal conductivity than carbon fiber — the nylon matrix needs more heat to flow around the particles. Start at 265°C.
Bed: 85–95°C on Garolite or PEI with PVA glue stick. Large brim recommended.
Enclosure
Required. Same reasoning as CF-Nylon and plain nylon: GF-Nylon delaminates without a warm chamber.
Post-Processing and Machining
GF-Nylon is machinable — it can be drilled, tapped, and milled. However, glass fiber tools wear fast. Use carbide tooling if machining GF-Nylon parts. Standard HSS drill bits and taps will work for occasional holes but dull quickly. Wear eye protection when machining — glass fiber chips are sharp.