What material should I choose for an FDM 3D printed part?

PLA vs PETG vs ASA at a glance

A general comparison of common FDM filaments. Exact properties vary by brand, print settings and part design, so treat this as a starting point, not a specification.

Best for indoor prototypes and everyday parts

PLA+ is the default for good reason. It prints accurately with little warping, holds fine detail, and is strong enough for enclosures, organisers, holders, models and most prototypes. Its main limit is heat: PLA-based parts can soften and deform in a car on a sunny day, near a radiator, or next to a warm motor.

Best for functional parts

For parts that clip, flex slightly, get knocked or sit somewhere warm, PETG is often the safer choice. It is tougher and less brittle than PLA, tolerates moisture well, and copes with somewhat higher temperatures. For parts that need extra stiffness rather than toughness — fixtures, rigid brackets — carbon-fibre filled filaments are an option. Print settings matter as much as material for strength; see choosing print quality.

Best for outdoor use

Sunlight and weather degrade plastics over time. ASA is widely used for outdoor FDM parts because it resists UV and weathering better than PLA or PETG. PETG can be adequate for many outdoor parts, particularly shaded or short-lived ones, but may fade or become brittle with long exposure. PLA isn't recommended for permanent outdoor use.

ASA prints best in an enclosed printer with good ventilation, so Layer & Loop Store doesn't currently offer it on instant or custom orders. If your part genuinely needs ASA, email [email protected] before ordering.

When material choice really matters

• Heat: anything in a car, near a heat source or in direct summer sun.
• Sustained load: plastics slowly creep under constant force, PLA more than PETG.
• Repeated flexing: clips and living hinges last longer in tougher materials.
• Outdoors: UV and weather.
• Chemicals and food: printed parts are porous and not certified for food contact; don't rely on a print for food or chemical containment unless the material and process are verified for it.

No material makes an FDM print suitable for safety-critical or certified applications.

Other engineering materials

ABS and nylon are other engineering filaments you may see elsewhere for higher-heat or wear-resistant parts. They have specific handling requirements and aren't currently offered by Layer & Loop Store.

Choosing a material for a Layer & Loop Store order

Stock varies, so specific colours aren't guaranteed to be available at all times. See the materials page for current details.

Quick picker

• General part, prototype, display → PLA+.
• Needs toughness, mild heat or damp conditions → PETG.
• Long-term outdoor or UV exposure → ASA (ask first — not currently offered as standard).
• Needs to flex or grip → TPU.
• Needs extra stiffness / technical finish → carbon-fibre filled.
• High heat, heavy engineering or certified use → a specialist supplier.