PETG vs PLA: Which Filament Should You Use?

PLA and PETG are the two filaments most people use. PLA is the easy default. PETG costs a little more effort and gives you tougher, more heat-tolerant parts. This guide compares them on the things that decide which to buy, using manufacturer documentation, and ends with a simple rule for choosing.

The short answer

• Use PLA for display models, figures, prototypes, toys and anything that stays indoors and cool. It is the easiest material to print well.
• Use PETG for functional parts: brackets, enclosures, garden or workshop items, and anything that may get warm or knocked about.
• If you are new, start with PLA, get reliable first layers, then add PETG when a project needs it.

PETG vs PLA side by side

The figures below come from Prusa's knowledge base guides for each material and its Prusament PETG data sheet. Other brands list different ranges, and the temperature printed on your own spool always comes first.

Strength and toughness

PLA is stiff but brittle. Prusa describes it as inflexible, with parts that break along the layers or into shards when hit. PETG is the opposite: it gives a little before it breaks, which is why it is the usual upgrade for parts that get handled, clipped or dropped.

Heat resistance

This is the deciding factor for many projects. Prusa says PLA gets soft and deforms above 60 °C. A car parked in the sun is the classic example. PETG tolerates more: Prusa's guide says parts work for most uses below 80 °C, though the Prusament PETG data sheet gives 68 °C, so leave a margin and do not run either material near its limit.

Ease of printing

PLA is more forgiving. It prints at a lower temperature and is not prone to significant warping, and Prusa recommends it for detailed models, figures and quick prototypes. PETG needs more care in three places:

• Stringing. Fine strands between parts are common. Prusa suggests more retraction and a lower nozzle temperature, and active cooling helps. Our guide to fixing stringing covers the order to try things in.
• Bed adhesion. Prusa warns against printing PETG on a smooth PEI sheet because it can stick too strongly. Use a textured or powder-coated sheet, or a thin layer of glue stick as a release agent.
• Overhangs and bridges. PETG is weaker here, so orient parts to avoid long unsupported spans, and expect supports to be harder to remove.

Moisture

Both materials absorb moisture from the air, and wet filament causes stringing, rough surfaces and weak prints. Bambu Lab's wiki publishes separate drying recommendations for PLA and PETG, and a sealed box with desiccant stops the problem before it starts. See how to dry filament.

Food contact

Prusa describes PETG as a food-safe material but still advises against 3D-printed dishes, because bacteria can grow in the grooves between layers unless the surface is sealed with a food-safe coating. If any printed part will touch food, follow the filament maker's guidance for that specific product.

Which should you pick?

For a wider comparison that also covers ABS, ASA and TPU, read PLA vs PETG vs ABS vs TPU. If you are choosing a printer as well as a material, the first printer checklist is the place to start.

This guide is built from manufacturer documentation. We have not run side-by-side print tests, and the figures above are the makers' recommendations, not our measurements.