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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.
FAQ
Frequently asked questions
Is PETG stronger than PLA?
PETG has higher impact strength (80 J/m vs 25 J/m) and is significantly tougher — it bends before breaking. PLA has a higher tensile modulus (2.3 GPa vs 1.5 GPa) making it stiffer, but PLA is brittle under impact loads.
Can PLA handle heat?
No. PLA softens at 55°C, which means it warps in a hot car, near a window in direct sun, or in any warm environment. PETG handles up to 68°C, and ASA handles 93°C for outdoor use.
Is PETG food safe?
PETG has food-safe options available. PLA is made from corn starch but is not rated food-safe in printed form due to layer line porosity that can harbor bacteria. Neither should be used for repeated food contact without food-safe coatings.
Which is cheaper, PLA or PETG?
PLA is the cheapest FDM material at Makelab. PETG costs slightly more but offers dramatically better mechanical performance. For most functional prototyping, the PETG price premium is worth the improvement in toughness and chemical resistance.
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