PLA vs ABS: Strength, Heat and Ease of Printing

PLA vs ABS comes down to ease against toughness: PLA is the easy, low-warp filament for models and indoor parts, while ABS is the tougher, more heat-tolerant plastic that needs an enclosure and good ventilation. For most people, PLA is the right first choice.

Is PLA or ABS better?

Neither is better overall: PLA is better for ease and detail, ABS is better for heat and impact.

• Choose PLA for display models, prototypes, toys, desk organizers and anything that stays indoors and cool.
• Choose ABS for functional parts that must take knocks or sit somewhere warm, such as brackets, housings and tool holders, if your printer is enclosed.
• If you are new, start with PLA, then move to ABS once first layers are reliable and a project needs it.

PLA vs ABS side by side

The figures come from Prusa's knowledge base pages for PLA and ABS, and the material guide for the PLA temperature range. Other brands publish different ranges, and the numbers printed on your own spool always come first.

Is ABS stronger than PLA?

ABS is tougher, meaning it absorbs impact, while PLA is more brittle.

Prusa describes PLA as brittle and inflexible, with weaker layer adhesion than other filaments, so parts break along the layers or into shards on impact. It lists ABS as having high tenacity and mechanical resistance, and recommends it for cheap technical parts that need heat and impact resistance. Wikipedia's ABS entry makes the same point, noting favorable impact resistance, toughness and rigidity compared with many common polymers. For a part that gets dropped, clipped or flexed, ABS is the safer pick.

Is PLA easier to print than ABS?

Yes, by a wide margin: PLA prints cooler, does not need an enclosure and rarely warps.

Prusa lists PLA as low-priced, easy to print, suitable for beginners and good for large models. ABS asks for more in four places:

1. A hotter nozzle and bed. Prusa recommends 255 °C and 100 °C for ABS, against 210 °C and 60 °C for PLA. Our ABS print settings guide and PLA print temperature guide cover each in detail.
2. An enclosure. Prusa recommends printing ABS in an enclosure with a warmer ambient temperature. Without one, it suggests the draft shield option in PrusaSlicer. See enclosed vs open-frame printers if you are choosing a machine.
3. Warping control. ABS shrinks as it cools, which causes warping. Prusa suggests a smooth or powder-coated PEI sheet with glue stick, and Wikipedia mentions a brim or raft. If layers split instead, read how to fix ABS cracking.
4. Ventilation. Prusa lists potentially dangerous fumes (styrene) as a con and advises a well-ventilated room, without a draft blowing on the print.

Which is more heat resistant, PLA or ABS?

ABS. Prusa says PLA gets soft and deforms at temperatures over 60 °C, which a closed car in summer can reach.

ABS has good high-temperature resistance in Prusa's description, and Wikipedia gives its glass transition temperature as about 105 °C. That is the point where the plastic begins to soften, not a safe working temperature, so leave a wide margin for any part under load. For parts near hot components, check the filament maker's data sheet, and note that Prusa suggests a more heat-resistant material such as Prusament PC Blend where enclosure heat could deform ABS parts.

Is ABS safe to print at home?

ABS can be printed at home with sensible precautions, but it needs good ventilation, unlike PLA.

Prusa lists potentially dangerous fumes (styrene) among ABS's drawbacks and tells users to print in a well-ventilated room. Wikipedia notes that researchers have raised concerns about ultrafine particles released during 3D printing. We do not give health or electrical advice, so follow your printer maker's and filament maker's safety guidance, and read our 3D printer safety basics before running ABS indoors.

Can you use PLA or ABS outdoors?

Neither is ideal. Prusa says PLA is not suited to outdoor use because it degrades under UV light, and says ABS lacks UV resistance, so outdoor parts yellow and become brittle over time.

For sun-exposed parts, Prusa points to ASA as the UV-resistant alternative. See ASA vs ABS and the best filament for outdoor use.

Should beginners print PLA or ABS first?

PLA first. It forgives poor first layers, runs on open-frame printers and gives clean detail on models, figures and quick prototypes, all points Prusa lists in its favor. ABS adds the enclosure, the hotter bed, the warping risk and the ventilation question, so it rewards experience. Print a few PLA parts, learn to tune temperature and adhesion, and only then take on ABS for a part that really needs the extra toughness.

PLA vs ABS: which should you pick?

If you also want a middle option that is tougher than PLA but easier than ABS, read PETG vs PLA and ABS vs PETG. The what is ABS filament explainer goes deeper on the tougher material, and types of 3D printer filament compares the whole range.

This guide is built from maker documentation and an encyclopedia entry. We have not run side-by-side print tests, so the figures are the sources' recommendations, not our measurements.