PLA vs PETG: Which Material Should You Choose for Your 3D Print?

When you want to have a 3D print project made, one of the first questions is: which material? PLA and PETG are the two most widely used filament types, but they behave very differently in practice. In this article we put them side by side so you know exactly what you’re choosing.

What is PLA?

PLA (polylactic acid) is made from renewable raw materials like corn starch. It’s the most accessible 3D printing material: easy to print, relatively cheap, and available in almost any color.

PLA advantages:

• Low print temperature (190-220°C)
• Minimal warping risk
• Sharp details possible
• Biodegradable (industrially)
• Affordable

PLA disadvantages:

• Starts deforming at temperatures above 60°C
• Brittle under impact
• Not suitable for outdoor use (UV sensitive)
• Snaps rather than bends

What is PETG?

PETG (polyethylene terephthalate glycol) is chemically related to the plastic used in drink bottles. It combines PLA’s printability with better mechanical properties.

PETG advantages:

• Higher temperature resistance (up to 80°C)
• Resistant to UV and moisture
• Tough and impact resistant
• Chemical resistance
• Highly recyclable

PETG disadvantages:

• Slightly harder to print than PLA
• Higher print temperature (230-250°C)
• Can cause stringing
• Slightly more expensive

Head-to-head comparison

Strength and durability

PETG wins on most mechanical fronts. It bends before it breaks, which means parts can absorb a knock without failing. PLA is harder but more brittle: it fractures more easily under sudden impact.

For decorative objects, prototypes and indoor items, PLA is fine. For functional parts that need to handle forces, choose PETG.

Temperature resistance

This is a crucial difference. PLA starts deforming at 55-60°C, which means a car in summer (dashboards can reach 80°C) will damage PLA parts. PETG holds up to 75-80°C.

For anything used outdoors, in a car, or near heat sources: always PETG.

Ease of printing

PLA is more forgiving. Lower temperature, less warping, and easier bed adhesion make it ideal for beginners. PETG requires more fine-tuning: the right print and bed temperature, good cooling settings, and sometimes retraction adjustments to prevent stringing.

At 3Dennis we print with both materials daily and know the settings inside out.

Outdoor use

PETG is the only real choice for outdoor use. UV radiation degrades PLA and makes it brittle. PETG is UV-stable and resistant to rain and moisture. For extreme outdoor applications ASA is even better, but for standard outdoor use PETG works excellently.

Read our article on PETG for outdoor applications for more details.

Price

PLA is typically 10-20% cheaper per kilogram. For large projects this can matter, but for small batches the difference is negligible.

When to choose which?

Choose PLA when:

• It’s a decorative or non-functional object
• Indoor use at room temperature
• Fine details are important
• You want quick delivery at lower cost

Choose PETG when:

• The part will experience mechanical loads
• Outdoor or in-car use
• Temperatures above 50°C are possible
• Long-term durability is needed
• Contact with moisture or chemicals is possible

Our default choice at 3Dennis

For most business orders we print in PETG as standard. The mechanical properties are better, the lifespan longer, and the extra printing cost is minimal. This fits our focus on quality for businesses.

For decorative or prototype applications where the customer wants to save on cost, PLA is an excellent choice.

Conclusion

PLA and PETG are both excellent materials, but for very different applications. PLA is the easy choice for prototypes, decoration and indoor use. PETG is the smart choice as soon as mechanical requirements, temperature or outdoor use come into play.

Not sure which material fits your project best? Get in touch and we’ll be happy to advise you. At 3Dennis we have the experience to recommend exactly the right material for your application.