Is PLA or PETG stronger?

PLA has higher tensile strength (~50 MPa vs ~45 MPa) but is brittle and snaps under impact. PETG is tougher and more impact-resistant, bending before breaking. For structural parts, PETG is generally the better choice due to its ductility.

Can I use PLA outdoors?

PLA is not recommended for outdoor use. It degrades under UV exposure, becomes brittle over time, and softens in direct sunlight on warm days (above 55°C surface temperature). PETG or ASA are much better for outdoor applications.

PETG is the same plastic used for water bottles and food containers, so the base material is food-safe. However, 3D printed parts have layer lines that can harbour bacteria. For food contact, use food-safe coating or limit to single-use applications.

Why does PETG string more than PLA?

PETG has higher melt viscosity and more hygroscopic behaviour, making it stringier. To reduce stringing: dry your filament, increase retraction distance (4-6mm for Bowden), reduce temperature by 5°C, and enable coasting in your slicer.

Which is easier to print?

PLA is significantly easier to print. It has a wider temperature window, lower warping tendency, minimal stringing, and better overhangs. PETG requires more tuning, especially for retraction and bed adhesion (it can stick too well to PEI).

3DPrintCalcs

PLA vs PETG Calculator — Material Comparison

Compare PLA and PETG properties side by side for your specific use case.

Primary Use Case

Max Operating Temperature

Highest temp the part will see

Needs Impact Resistance?

Food Contact?

UV/Outdoor Exposure?

How We Calculate This

Comparison Method

This calculator scores PLA and PETG based on your specific requirements:

Temperature: High heat = PETG wins (75°C vs 55°C HDT)
Use case: Indoor/decorative = PLA; outdoor/mechanical = PETG
Flexibility needs: PETG has better impact resistance
UV exposure: PETG has much better UV resistance

Each factor adjusts the score for both materials. The material with the higher total score is recommended for your application.

Frequently Asked Questions

Related Calculators

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Material Weight Calculator

Calculate the weight of a printed part from its volume and material density.

Post-Processing Calculator

Estimate time and materials for sanding, priming and painting printed parts.

Last updated: February 2026

All calculations are estimates. Always verify settings with test prints before committing to final prints.