PLA vs PETG vs ABS vs ASA: Which Filament Should You Choose?

PLA, PETG, ABS and ASA are the four most common FDM filaments for real parts. They look similar on the spool, but they behave very differently once a part is in use: in the sun, near a motor, or under a load. This guide compares them in plain terms so you can pick the right one before you order.

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Quick comparison

	PLA	PETG	ABS	ASA
Stiffness	High	Medium	Medium	Medium
Toughness (impact)	Low, brittle	Good	Good	Good
Heat resistance (softens around)	55–60 °C	About 80 °C	About 100 °C	About 100 °C
Outdoor / UV resistance	Poor	Fair	Poor (yellows)	Very good
Chemical resistance	Low	Good	Fair	Fair
Surface finish	Very good	Glossy	Good, can be smoothed	Matte, good
Relative cost	Lowest	Low	Low	Medium

Heat values are approximate softening points. Real limits depend on the load and the exact grade.

PLA: best for prototypes and display parts

PLA is easy to print, stiff and accurate, with crisp details and good colours. It is the cheapest way to check size, fit and look. Its weak points are heat and impact: a PLA part left in a hot car can sag, and it tends to snap rather than bend. Choose PLA for concept models, fit checks, display pieces and jigs that stay indoors at room temperature.

PETG: the all-rounder for functional parts

PETG is tougher than PLA and handles more heat. It bends before it breaks, resists many chemicals and water, and works well for brackets, enclosures, holders and parts that get handled every day. It can leave fine strings on detailed parts, and its surface is glossy rather than crisp. If you are unsure which filament to choose for a working part, PETG is usually a safe start.

ABS: tough and heat resistant

ABS is the classic engineering plastic used in many consumer products. It survives higher temperatures than PETG and can be sanded, glued and smoothed with solvent for a near-moulded finish. It shrinks more while cooling, so large flat parts can warp, and it fades or yellows in strong sunlight. Use ABS for automotive interior parts, housings near warm electronics and parts you plan to post-process.

ASA: ABS for outdoor use

ASA has similar strength and heat resistance to ABS but much better resistance to UV light and weather. It keeps its colour and strength outdoors far longer. It costs a little more and, like ABS, needs good design to avoid warping on large parts. Choose ASA for outdoor fixtures, garden and marine parts, car exterior trim and signage.

How to choose in 30 seconds

• Just checking shape or fit? PLA.
• Working part used indoors? PETG.
• Near heat, or needs a smoothed finish? ABS.
• Outdoors or in the sun? ASA.
• Needs to flex or survive repeated snapping? Consider nylon (SLS or MJF) or TPU instead.

Frequently asked questions

Is PETG stronger than PLA?

PLA is stiffer and can carry a higher load before bending, but PETG is tougher: it absorbs impacts and bends instead of snapping. For parts that get knocked or flexed, PETG usually lasts longer.

Can PLA be used outdoors?

Only for short periods or in shade. Sunlight and heat soften and weaken PLA over time. ASA is the better outdoor choice.

Which filament is food safe?

Food safety depends on the exact material grade, the printer and the surface. Layer lines can trap bacteria, so most printed parts are not recommended for repeated food contact without a food-safe coating.

Still unsure? Read our complete materials guide and our tips on making printed parts stronger, then upload your file for an instant quote in any of these materials.