Is ABS stronger than PLA?

ABS has higher impact resistance and toughness than standard PLA — it bends before breaking. PLA+ (impact-modified PLA) closes most of this gap. ABS has significantly better heat resistance (glass transition ~105°C vs ~55–60°C for PLA). For heat resistance, ABS wins clearly. For pure structural strength, PLA+ is comparable to ABS and much easier to print.

Why should I use PLA instead of ABS?

PLA is easier, more accurate, and does not warp. ABS requires an enclosure, runs at 230–255°C nozzle temperature, needs a 100–110°C bed, and warps significantly without careful setup. PLA prints reliably at 200–215°C without an enclosure. For 90% of prints that don't need heat resistance above 55°C, PLA or PLA+ is the better choice.

Is ABS safe to print?

ABS releases styrene and ultrafine particles when printed. At typical print temperatures and durations in a ventilated space, exposure is low. However, printing ABS in an unventilated room over long sessions creates measurable air quality issues. Use an enclosed printer with a HEPA + activated carbon filter, or print in a well-ventilated area. Avoid printing ABS in bedrooms or small closed spaces.

PLA vs ABS

PLA and ABS were the two original FDM filaments. ABS was once the go-to engineering material, but modern alternatives (ABS+, ASA, PLA+, PETG) have changed the calculus. Here is an honest comparison of when ABS is still the right choice — and when it is not.

At a glance

PLA

Nozzle temp190–220°C

Bed temp55–65°C

EnclosureNot needed

Warp riskLow

Heat deflection~55°C

Impact resistanceMedium (PLA+: High)

Post-processingSand, paint

UV resistancePoor

DifficultyEasy

Cost / kg$15–25

ABS

Nozzle temp230–255°C

Bed temp100–110°C

EnclosureRequired

Warp riskHigh

Heat deflection~100°C

Impact resistanceHigh

Post-processingSand, paint, acetone

UV resistancePoor

DifficultyHard

Cost / kg$18–28

When ABS is actually worth it

ABS has three genuine advantages over PLA that justify its complexity:

High heat resistance: ABS has a glass transition temperature of ~105°C vs ~55°C for PLA. If a part will be in a car interior in summer (dashboard temperatures reach 80–100°C), near a heat source, or exposed to boiling water, ABS or ASA is required. PLA will soften and deform in these environments.
Acetone welding and smoothing: ABS dissolves in acetone. This enables two valuable finishing techniques: (1) acetone vapor smoothing — place a printed ABS part in a sealed container with acetone vapor for 10–30 minutes to dissolve the outer layer into a glass-smooth surface; (2) acetone welding — join ABS parts by applying liquid ABS dissolved in acetone to the joint. No other common filament offers this.
Established industrial precedent: ABS is used in automotive, consumer electronics, and industrial tooling because its material properties are well-characterized and it was the standard for decades. If you are matching a component that must interface with an existing ABS-molded part, printed ABS will have the same dimensional stability.

Why PLA+ often wins in practice

Modern PLA+ (impact-modified PLA) has closed most of ABS's strength advantage while keeping PLA's ease of printing. PLA+ at 215–230°C nozzle temperature prints on any open-frame printer without warping, produces good overhangs, and achieves tensile strength close to ABS.

The main things PLA+ cannot match ABS for: heat resistance above 60°C, acetone post-processing, and very high impact requirements. For everything else — structural brackets, enclosures, functional prototypes, mechanical parts at room temperature — PLA+ is the simpler choice.

ABS or ASA for outdoor use?

Neither PLA nor ABS is UV-stable. ABS in direct sunlight becomes brittle and discolors within months. If outdoor UV resistance is the requirement, use ASA instead — it has identical print settings to ABS but with UV stabilizers added. See theABS vs ASA guide for the full comparison.

Settings and database links

PLA settings database →ABS settings database →ABS printing guide →ABS vs ASA →

Browse PLA / ABS settings by printer

All PLA settings → · All ABS settings →