PLA filament versus PETG filament, which filament to choose

What is PLA filament?

PLA (polylactide) is a biodegradable polymer that is made from renewable raw materials such as corn or potato starch. This makes PLA one of the most environmentally friendly filaments available on the market. Its popularity stems from its ease of use, making it an ideal choice for novice 3D printer users.

Chemical properties of PLA

• Chemical structure: Polylactide is a lactic acid polymer.
• Raw material source: Produced from renewable raw materials such as plants.
• Biodegradability: PLA is biodegradable, which means it decomposes naturally under the right conditions.

Physical properties of PLA

• Printing temperature: 180°C - 220°C.
• Bed temperature: 0°C - 60°C.
• Mechanical strength: High hardness, but less flexible than PETG.
• Post-shrinkage: Low, resulting in precise prints.

Applications of PLA filaments

PLA is an ideal material for creating prototypes, decorative models, toys, and parts that will not be subjected to high mechanical stress. Due to its biodegradability, it is often used in the production of packaging and disposable tableware.

What is PETG filament?

PETG (polyethylene terephthalate glycol) is a thermoplastic polymer that combines the properties of PET (a material used in the production of plastic bottles) with glycol, which gives it greater flexibility and impact resistance. PETG is more durable than PLA, making it ideal for more demanding applications.

Chemical properties of PETG

• Chemical structure: Modified polyethylene terephthalate, in which glycol is added during the manufacturing process.
• Biodegradability: PETG is not biodegradable, but it can be recycled.

Physical properties of PETG

• Printing temperature: 220°C - 260°C.
• Bed temperature: 60°C - 80°C.
• Mechanical strength: Higher than PLA, with greater flexibility and impact resistance.
• Post-shrinkage: Low, ensuring dimensional stability.

Applications of PETG filaments

PETG is more durable and flexible than PLA, making it ideal for applications that require greater impact resistance and mechanical strength, such as mechanical parts, tool prototypes, and components exposed to moisture.

Comparison of PLA and PETG

Differences in the practical use of PLA and PETG

The choice between PLA and PETG filament depends mainly on the specifics of the project and user requirements. PLA is easier to print because it does not require high temperatures or a heated bed. Its low toxicity and biodegradability make it a popular choice among novice 3D printer users. On the other hand, PETG offers significantly higher strength and flexibility, making it more suitable for advanced projects that must withstand greater mechanical loads and extreme conditions.

Summary

Both PLA and PETG are excellent filaments for 3D printing, but their applications differ depending on your needs. PLA is perfect for projects with lower mechanical requirements, where biodegradability and ease of use are priorities. PETG, on the other hand, is more durable, flexible, and resistant to harsher conditions, making it the ideal choice for more advanced projects.

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