ABS-GF (glass-fiber ABS): density, print temperature and when to choose it
ABS-GF is plain ABS reinforced with chopped glass fiber (usually 10–20%). Glass fiber increases stiffness and noticeably reduces the warping typical of plain ABS, at the cost of some impact strength and a more matte, rougher printed surface.
Key properties
| Parameter | Value |
|---|---|
| Density | ≈1.18 g/cm³ |
| Nozzle temperature | 240–260°C |
| Bed temperature | 95–110°C |
| Part cooling | minimal |
| Shrinkage | lower than plain ABS, but still noticeable |
| Enclosure required | yes |
When to use it
- Functional housings and brackets where stiffness and geometric stability of large parts matter.
- Fixtures operating under moderate heat (e.g. near electronics) where plain ABS isn't stiff enough.
- Replacing plain ABS where corner lifting from shrinkage has become a problem.
- Prototypes of parts that are series-produced by glass-filled ABS injection molding.
When to pick something else
- Impact strength matters more than stiffness — reinforcement makes the material more brittle; plain ABS or ASA bend rather than crack.
- You need the highest stiffness among ABS-like materials — ABS-CF (carbon fiber) gives a higher modulus at lower weight.
- The part is used outdoors — glass fiber has no UV protection, so ASA is a better fit for outdoor tasks.
Pros and cons
Pros: noticeably less warping and shrinkage than plain ABS, higher stiffness and geometric stability, more affordable than carbon-fiber alternatives.
Cons: more brittle on impact than plain ABS; matte, rough printed surface; glass fiber speeds up brass nozzle wear; still carries ABS's ventilation requirements (odor while printing) and enclosure needs.
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ABS-GF prints at nearly the same temperatures as plain ABS, so energy use is comparable, but the defect rate is usually lower — reinforcement reduces warping and corner lifting, the main source of failed prints with plain ABS. Among additional costs, expect faster wear on a standard brass nozzle from the glass fiber's abrasiveness — for regular work with this material a hardened nozzle pays for itself faster than it looks on paper.