ASA-GF: density, print temperature and when to choose it
ASA-GF is plain ASA reinforced with glass fiber: it raises stiffness and heat resistance in a similar way to ASA-CF, but glass fiber is cheaper than carbon fiber and doesn't make the part electrically conductive or visually "technical" — the surface stays closer to plain ASA. In exchange, ASA-GF is a bit heavier and slightly less stiff than the carbon-fiber version.
Key properties
| Parameter | Value |
|---|---|
| Density | ≈1.20 g/cm³ |
| Nozzle temperature | 250–270°C |
| Bed temperature | 95–110°C |
| Part cooling | light |
| Shrinkage | lower than plain ASA |
| Enclosure required | yes |
Glass fiber, like carbon fiber, is abrasive and wears down brass nozzles quickly — printing ASA-GF requires a hardened steel or carbide nozzle, otherwise the bore diameter gradually grows and print accuracy suffers.
When to use it
- Outdoor and functional parts where stiffness and heat resistance matter, but the extra cost and conductivity of carbon fiber aren't needed.
- Fasteners and housings operating at elevated temperatures in the sun, where plain ASA deforms.
- Replacing ASA-CF in budget-constrained projects where the "technical" fiber look isn't essential.
When to pick something else
- You need maximum stiffness and minimum weight — ASA-CF gives higher stiffness per unit mass thanks to carbon fiber.
- The part sees no sun exposure and no stiffness requirements — plain ASA is simpler to print and cheaper.
- A smooth, attractive surface without fiber texture matters — consider PETG or base ASA.
Pros and cons
Pros: higher stiffness and heat resistance relative to base ASA, cheaper than ASA-CF with a comparable reinforcing effect, retains UV and weather resistance.
Cons: requires a hardened nozzle due to glass fiber abrasiveness, a rough matte-effect surface, needs an enclosure, slightly heavier than ASA-CF at the same volume.
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As with ASA-CF, the main hidden cost is nozzle wear: without a hardened or carbide tip, print accuracy drops after just one or two spools, and the nozzle replacement should be budgeted as a recurring depreciation item. The filament itself is usually cheaper than ASA-CF, making it a more economical choice when high stiffness is needed but the extra cost of carbon fiber isn't justified.