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PLA vs PETG — choosing the right FDM material.
PLA and PETG are the two most popular FDM materials. PLA is the cheapest and easiest to print — great for concept models and early prototypes. PETG is tougher, more heat-resistant, and chemically resistant — a better choice for functional parts, lab environments, and anything that needs to survive real-world use. The price difference is modest, so the choice comes down to mechanical requirements.
Detailed comparison
Property-by-property breakdown
| Property | PLA | PETG |
|---|---|---|
| Tensile modulus | 3.5 GPa | 2.0 GPa |
| Impact strength | 25 J/m | 80 J/m |
| Heat deflection | 52°C | 70°C |
| Surface roughness | 15 Ra μm | 15 Ra μm |
| Chemical resistance | Low | Good |
| UV resistance | Poor — degrades outdoors | Moderate |
| Biodegradable | Yes | No |
| Food-safe options | No | Yes |
| Cost | $ | $$ |
| Best for | Concept models, visual prototypes | Functional parts, lab fixtures, production |
Our recommendation
Choose PLA when cost is the priority and the part will not face heat, UV, or mechanical stress — concept models, form-factor checks, and early design reviews. Choose PETG when you need toughness, chemical resistance, or heat resistance up to 70°C — functional prototypes, lab fixtures, and production parts.
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