PLA Tough (PLA Strong): density, print temperature and when to choose it
PLA Tough (PLA Strong), like PLA+, is PLA with additives to boost impact resistance, but with a key difference: under this name brands usually publish specific figures from GOST/ASTM tests (flexural strength, elongation at break, Izod impact strength), rather than just a marketing "plus." If PLA+ is "better PLA with no guarantees," PLA Tough is an engineering formula with a datasheet you can actually design a loaded part around.
Key properties
| Parameter | Value |
|---|---|
| Density | ≈1.24 g/cm³ (same as plain PLA) |
| Nozzle temperature | 205–225°C |
| Bed temperature | 50–60°C |
| Part cooling | 80–100% |
| Shrinkage | minimal |
| Enclosure required | no |
When to use it
- Functional parts with precise strength requirements, where you need datasheet numbers rather than general "plus" promises.
- Fasteners, clips, instrument housings that must withstand impact and vibration without switching to ABS/PETG.
- Replacing PLA+ where a previous batch from an unknown brand gave unpredictable results.
When to pick something else
- Budget is limited and strength requirements aren't critical — plain PLA or the less strictly specified PLA+ is cheaper.
- You need heat resistance above 55–60°C — as with any PLA, HDT isn't improved; you need ASA, PETG, or annealed High Temp PLA.
- You need flexibility rather than stiffness with impact resistance — look at TPU.
Pros and cons
Pros: impact resistance and elongation figures verified by testing, predictable batch-to-batch behavior within one brand, prints as easily as plain PLA.
Cons: costs more than base PLA and often more than unguaranteed PLA+, heat resistance isn't improved, color choice in engineering lines is usually narrower.
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By temperature and energy use, PLA Tough prints like plain PLA — the cost difference is almost entirely in the spool price (usually 20–40% more than base PLA). That premium is worth it wherever the cost of a part failing from an impact crack outweighs the savings of a cheaper PLA+ with no documented properties.