What is the main difference between ABS and ASA?

ABS and ASA are chemically close cousins with nearly identical toughness and heat resistance — both soften around 98-105°C per manufacturer spec sheets. The difference is UV stability: ASA is formulated with a UV stabilizer that ABS lacks, so ASA resists yellowing and brittleness outdoors for years while ABS visibly degrades within months of sun exposure. If a part stays indoors, ABS is cheaper and just as capable; if it sees daylight, ASA is the correct material.

Is ASA stronger than ABS?

Not meaningfully. ABS and ASA share nearly the same impact resistance and softening point (both around 98-105°C), so neither has a real strength edge over the other indoors. The gap only opens outdoors, where ASA's UV stabilizer keeps it from turning brittle and losing strength after months of sun exposure — a fate unprotected ABS parts don't avoid.

What temperature do you print ABS and ASA at?

ABS prints at 230-250°C nozzle with a 100-110°C bed, per Polymaker and Hatchbox spec sheets. ASA runs slightly hotter at 240-260°C nozzle with a 90-110°C bed, per Polymaker, ELEGOO, and SUNLU spec sheets. Keep cooling fans low for both — too much cooling causes the same layer cracking and delamination on either material.

Is ABS or ASA better for outdoor parts?

ASA, without question. Quality ASA spools are rated for roughly 5-10+ years of outdoor UV exposure before visible yellowing or brittleness, according to filament-tracking site SpoolHound and UV-resistance claims from brands like Extrudr and FormFutura. Unprotected ABS degrades outdoors within a few months. For garden brackets, drone frames, automotive trim, or anything that sees direct sun, ASA is the material built for the job.

Is ASA worth the extra cost over ABS?

For indoor parts, no — ABS does the same job for less money. Polymaker's ABS runs about $22-25/kg versus about $24-27/kg for Polymaker's ASA, only a few dollars more per spool. But for anything that lives outside, that small premium buys years of UV resistance ABS simply doesn't have, which makes ASA the cheaper option long-term once you account for reprinting a sun-damaged ABS part.

ABS vs ASA 2026: Which Tough 3D Printer Filament Should You Use?

Q: Do you need an enclosure for ABS and ASA?

Yes, for both. ABS and ASA both shrink as they cool and warp or crack in a draft without a heated, enclosed chamber held roughly 40-60°C ambient — Bambu Lab, Prusa, and Creality all list an enclosure as a requirement for reliable results with either material. An open-frame printer works fine for PLA or PETG, but not for ABS or ASA.

Quick answer: Choose ABS for tough, heat-resistant parts that stay indoors — it's a few dollars cheaper per kilogram and just as strong. Choose ASA for anything that sees daylight: garden brackets, drone frames, automotive trim, sensor housings. Both soften around 98-105°C per manufacturer spec sheets and need an enclosed, heated printer, but only ASA's UV stabilizer keeps it from yellowing and turning brittle outdoors — quality ASA spools are rated for 5-10+ years of sun exposure versus a few months for unprotected ABS.

ABS and ASA get lumped together constantly, and for good reason — they’re chemically close cousins with nearly the same toughness, the same heat resistance, and the same demanding print profile. The one difference that actually matters is UV stability, and it’s the difference that decides which one belongs in your spool holder for a given part. This guide breaks down exactly where each one wins.

ABS vs ASA at a glance

Property	ABS	ASA
Nozzle temp	230–250°C	240–260°C
Bed temp	100–110°C	90–110°C
Softening temp	~98–105°C	~100°C
Impact resistance	High — absorbs impacts well	High — nearly identical to ABS
UV / outdoor durability	Poor — yellows within months	Excellent — rated 5-10+ years
Warping tendency	High — needs enclosure	High — needs enclosure
Odor while printing	Noticeable (styrene) — ventilate	Noticeable (styrene) — ventilate
Ease for beginners	Advanced	Advanced
Typical price	~$17–$25/kg	about $17-30/kg
Enclosure needed	Yes	Yes

ABS vs ASA by the numbers

~98–105°C for both: the softening temperature is nearly identical across ABS and ASA per manufacturer spec sheets from Polymaker and Hatchbox, which is why neither has a durability edge indoors — a tool handle survives a hot glovebox equally well in either material.
5-10+ years of outdoor UV exposure for ASA before visible yellowing or brittleness, according to filament-tracking site SpoolHound and UV-resistance claims from Extrudr and FormFutura, versus a few months for unprotected ABS in direct sun — the entire reason ASA exists as a separate material.
About $22-25/kg (ABS) vs $24-27/kg (ASA) for Polymaker’s top pick in each material — only a few dollars per spool separates them, which is why the choice should come down to UV exposure, not cost.

The 30-second verdict

ABS is the right default for tough parts that stay indoors. Tool handles, brackets, enclosures, anything near real heat but out of direct sun — ABS delivers the same toughness and heat resistance as ASA for a few dollars less per kilogram. The trade-off is identical to ASA’s: it needs an enclosed, heated printer and a ventilated room for the styrene smell.

ASA is the right choice the moment a part sees daylight. Garden brackets, drone frames, automotive trim, sensor housings — anything left outside needs ASA’s UV stabilizer, which keeps it from yellowing and turning brittle the way unprotected ABS does within months. For the full lineup including PLA, PETG, TPU, and nylon, see our best 3D printer filament guide.

UV stability and outdoor use: advantage ASA

This is ASA’s entire reason for existing. ABS and ASA share nearly the same toughness and heat resistance, but ABS has no UV stabilizer — it yellows, chalks, and turns brittle in sunlight within a few months. ASA is formulated specifically to resist that degradation, with quality spools rated for roughly 5-10+ years of outdoor exposure before noticeable damage, per filament-tracking site SpoolHound and manufacturer UV-resistance claims from brands like Extrudr and FormFutura. For anything that sits outside long-term — garden brackets, drone frames, automotive trim — ASA is the correct material, not an optional upgrade.

Heat resistance and toughness: essentially a tie

Neither material has a real edge here. Both ABS and ASA soften around 98-105°C per Polymaker and Hatchbox spec sheets, and both hold up to repeated flexing and impact about equally well. A tool handle or bracket that stays indoors performs the same whether it’s printed in ABS or ASA, which is exactly why UV exposure — not strength — is the deciding factor between the two.

Ease of printing: a wash, and both are advanced

ABS and ASA demand nearly the same setup. Both need an enclosed, heated chamber held roughly 40-60°C ambient — Bambu Lab, Prusa, and Creality all list an enclosure as a requirement for reliable results with either material, per our best 3D printer enclosure guide. Both print at a hot nozzle (230-260°C depending on brand), need low cooling fans to avoid layer cracking, and release a noticeable styrene smell that calls for a ventilated room. Neither is a first-print material.

Cost and availability: a small gap that matters only outdoors

Price barely separates the two. Polymaker’s PolyLite ABS runs about $22-25/kg, and Polymaker’s own ASA runs $24-27/kg — a few dollars per spool. Budget options like ELEGOO and SUNLU bring both materials down to roughly $17-20/kg. That small premium for ASA only pays off outdoors: a sun-damaged ABS part that needs reprinting every year costs far more over time than paying the ASA premium once.

Which should you buy?

Best ABS — Polymaker PolyLite ABS

Polymaker PolyLite ABS

Best overall ABS · 1kg spool · about $22-25/kg

Tight ±0.03mm diameter tolerance with minimal warping on a stock enclosed profile.
Prints at 230–250°C with a 100–110°C bed; needs an enclosure for reliable results.
Softens at roughly 98–105°C — plenty tough for indoor tool handles and brackets.
Not UV-stable — keep it indoors or expect yellowing within months outdoors.

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Polymaker PolyLite ABS is the pick for tough parts that never leave the house — tool handles, brackets, enclosures, anything that needs to survive heat but not the sun.

Best ASA — Polymaker ASA

Polymaker ASA

Best overall ASA · 1kg spool · $24-27/kg

Tight ±0.03mm diameter tolerance with clean, UV-stable prints.
Prints at 240–260°C with a 90–110°C bed; needs an enclosure for reliable results.
Rated for 5-10+ years of outdoor UV exposure before yellowing or brittleness sets in.
A few dollars more per kilogram than ABS — worth it the moment a part sees daylight.