3D PRINTING GUIDE
PLA vs PETG vs TPU: choosing a 3D printing material
Illustrative image; not a documented customer order.
There is no single best filament for every project. Consider where the part will be used, how it will be mounted and whether it needs to flex, resist impacts or tolerate elevated temperatures. Geometry, wall thickness and layer orientation matter just as much as the material name.
PLA: models, prototypes and visual components
PLA is a practical choice for display models, organisers, fit-checking parts and prototypes used at normal indoor temperatures. It can reproduce detail well and is often the simplest starting point. Its limitations include softening and deformation under heat or prolonged load. A desk organiser and a bracket inside a hot car require very different material choices.
PETG: many functional parts
PETG is commonly selected for housings, guards, brackets and spacers. It is generally tougher than conventional PLA, although chemical resistance, UV exposure and high-temperature performance depend on the exact grade and conditions. Thin snap-fits and sharp corners can still fail under repeated stress.
TPU: controlled flexibility
TPU is used for bumpers, protective feet, flexible sleeves and contact-damping components. Shore hardness indicates the material's characteristics, but the finished part's flexibility also depends on its thickness, infill and shape. A thick piece of TPU 95A can feel comparatively firm, while a thin section can bend significantly.
What matters besides material?
Consider loads, temperature, contact with liquids, UV exposure, fatigue, wall thickness, infill and print orientation. FDM parts are generally direction-dependent: strength across layer boundaries is not always equivalent to strength within a layer.
Quick practical guide
- Display or fit-check model: PLA is often suitable.
- General enclosure or functional bracket: PETG may be a stronger starting point.
- Bumper, foot or flexible guard: TPU is worth considering.
These are guidelines, not performance guarantees. Tell us about the application so the print can be evaluated as a whole. See also layer direction and strength.