PLA-GF: density, print temperature and when to choose it
PLA-GF is PLA filled with short glass fibers (usually 10–15% by weight). It targets the same jobs as PLA-CF — stiffness and stable geometry — but glass fiber is denser and cheaper than carbon fiber, so the composite is heavier and usually more affordable. It's often sold in a semi-transparent or natural gray color rather than PLA-CF's black matte.
Key properties
| Parameter | Value |
|---|---|
| Density | ≈1.32 g/cm³ (higher than plain PLA — glass fiber is significantly denser than the polymer) |
| Nozzle temperature | 210–230°C |
| Bed temperature | 50–60°C |
| Part cooling | 80–100% |
| Shrinkage | minimal, fiber reduces deformation compared to plain PLA |
| Enclosure required | no |
When to use it
- Rigid technical parts where dimensional stability matters, but the budget doesn't stretch to a carbon-fiber alternative.
- Fasteners, brackets, housings that don't need conductivity (unlike PLA-CF, glass fiber doesn't conduct current or interfere with Wi-Fi/GPS signals).
- Parts that will be painted or clear-coated — GF composites hold light colors better than black PLA-CF.
When to pick something else
- Minimum weight at maximum stiffness matters — PLA-CF is lighter at comparable stiffness.
- The part works near an antenna or RFID tag — glass fiber (unlike carbon fiber) doesn't shield the signal, but if even that's a concern, use plain PLA.
- You need heat resistance above 55–60°C — look at PA6-GF or PETG-GF.
Pros and cons
Pros: high stiffness at a lower price than carbon-fiber composites, doesn't shield radio signals, stable geometry while printing.
Cons: the fiber is abrasive and requires a hardened nozzle, the composite is heavier and more brittle than plain PLA, the surface is less smooth than plain PLA's.
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As with PLA-CF, the main expense isn't the spool itself (PLA-GF is usually cheaper than carbon-fiber alternatives), but abrasive nozzle wear: without hardened steel or a ceramic/ruby-coated nozzle, the bore diameter grows within 1–2 spools. Factor this into equipment depreciation, not just the price per gram of plastic.