Materials · 5 min read
PLA vs PETG: which should you choose?
An honest comparison of the two most common FDM materials: strength, heat, finish, and when each one is the wrong choice.
PLA and PETG are both widely used FDM materials, but they behave differently. The right choice depends on what the part has to survive.
PLA PLA is stiff, prints with crisp detail and good dimensional stability, and is usually the most economical option. - Good for visual prototypes, display and architectural models, indoor fixtures and fit checks - Weak point: it softens at relatively low temperatures. A PLA part left in a hot car or near a heat source can deform - More brittle than PETG: it tends to crack rather than bend under impact
PETG PETG is tougher and more forgiving under impact, tolerates more heat than PLA, and resists moisture and many common chemicals. - Good for functional brackets, mounts, enclosures and parts that are handled often - Weak points: surfaces can show slight stringing, fine details are a little less crisp, and it's not an engineering polymer for high loads or high heat
Quick guide - Mostly looks and fit? PLA - Gets knocked, flexed or warm? PETG - Outdoors long-term, in an engine bay, or structural? Ask us — it may need a material or process we don't offer, and we'll say so
A note on strength FDM parts are strongest along their layers and weakest between them. Orientation often matters as much as material. We choose orientation with your load direction in mind — tell us how the part is loaded.
General guidance for FDM printing. Results depend on your geometry, material and use — ask us about your specific part.