Best ASA Filament for 3D Printing: 5 Options Compared
Quick Answer
Pick ASA by the manufacturer's published print settings and your printer's ecosystem, not by brand reputation. Polymaker PolyLite ASA is a widely available general-purpose option with clearly documented settings. Prusament ASA publishes a per-spool tolerance figure (±0.04 mm) and is the specification-driven choice. Bambu Lab ASA makes sense if you run a Bambu Lab printer and want RFID profile matching. eSUN eASA and SUNLU ASA are budget-oriented alternatives worth comparing on delivered price.
ASA (Acrylonitrile Styrene Acrylate) exists for one main reason: parts that live outdoors. PLA softens and degrades in sun and heat, and ABS yellows and turns brittle under ultraviolet light. ASA is formulated to resist both UV exposure and weathering while keeping ABS-like strength and heat resistance.
This guide explains what actually separates one ASA spool from another, then compares five widely available options on the information their manufacturers publish. We have not run comparative outdoor exposure testing, so nothing here claims a measured winner — the point is to help you shortlist sensibly and then check current pricing and availability yourself.
Complete Filament Guide
New to engineering filaments? Start with our comprehensive guide covering all material types and their applications.
What ASA Does Well — and What It Costs You
These are general characteristics of the ASA material class. Individual formulations differ, so treat them as the reason to consider ASA rather than as a specification for any particular spool.
Why people choose ASA
- • Designed for UV and weather exposure
- • Better colour stability outdoors than ABS
- • Heat resistance in the ABS range, well above PLA
- • Good toughness for functional parts
- • Typically a matte, even surface finish
- • Bonds and finishes similarly to ABS
What it asks of you
- • An enclosure for consistent results
- • Ventilation — ASA emits styrene while printing
- • High bed temperatures and careful bed prep
- • Warping management on large flat parts
- • Generally fewer colours than PLA
- • Dry storage to avoid surface defects
Five ASA Filaments Worth Comparing
These are organised by the situation they suit, not as a ranked leaderboard. We have not measured them against each other.
Polymaker PolyLite ASA
PolyLite ASA is Polymaker's standard ASA line and the easiest of these to point someone at when they simply want a well-documented, widely stocked ASA. Polymaker publishes a clear settings range, which removes a lot of the guesswork that makes ASA frustrating the first time.
Why consider it
- • Clearly published manufacturer settings
- • Broad retail availability
- • Consistent matte finish
- • Part of a familiar, well-documented filament range
Manufacturer guidance
- • Nozzle: 240–260°C
- • Bed: 75–95°C
- • Print speed: 30–50 mm/s
- • Cooling fan: off
- • Enclosure: recommended for ASA generally
Settings above are Polymaker's published guidance for PolyLite ASA. Confirm the figures on your spool's packaging before printing, and compare the current delivered price before buying.
Shop PolymakerPrusament ASA
Prusament is the option to look at if you care about documented consistency. Prusa manufactures it in-house and publishes per-spool measurement data. Note the spool size when you compare cost: Prusament ASA is sold on 800 g spools, not 1 kg, so per-spool prices are not directly comparable with the others here.
Why consider it
- • Published dimensional tolerance of ±0.04 mm
- • Per-spool measurement data available
- • Manufactured in-house by Prusa
- • Well-supported slicer profiles in PrusaSlicer
Manufacturer guidance
- • Nozzle: 260 ± 5°C
- • Bed: 110 ± 5°C
- • Spool: 800 g
- • Tolerance: ±0.04 mm
- • Enclosure: recommended
Figures above are Prusa's stated specifications; the tolerance changed from ±0.03 mm to ±0.04 mm in May 2024. We have no affiliate relationship with Prusa — check availability and current pricing directly on Prusa's site.
Bambu Lab ASA
If you already run a Bambu Lab machine, buying Bambu's own ASA removes a setup step: the spools carry RFID tags that let the printer identify the material and load the matching profile. That convenience is the reason to pick it. It works on other printers too, but the RFID benefit disappears.
- • RFID spool identification on compatible Bambu Lab printers
- • Bambu-supplied slicer profiles in Bambu Studio
- • Enclosed Bambu printers suit ASA's chamber-temperature needs
- • Check the spool and Bambu's material page for current temperature guidance
We have no affiliate relationship with Bambu Lab. Confirm specifications and pricing on Bambu Lab's store.
eSUN eASA
eSUN is one of the most widely distributed filament brands, and its ASA is usually easy to find through general retailers. That availability, and a typically lower price than the premium brands, is the reason it appears here. eSUN publishes settings per product listing, and those can vary between variants — read the listing for the exact spool you are buying rather than assuming a shared spec.
We have no affiliate relationship with eSUN, so there is no purchase button here. Verify the temperature range, spool weight and diameter tolerance on the manufacturer's listing, and compare the current delivered price before buying.
SUNLU ASA
SUNLU sits in the same bracket as eSUN: broad distribution, generally lower prices than the premium brands, and specifications that are published per listing rather than as a single documented material datasheet. It is a reasonable way to try ASA without committing to a premium spool, provided you treat the printed settings as a starting point and tune from there.
We have no affiliate relationship with SUNLU, so there is no purchase button here. Confirm the manufacturer's stated temperatures and spool weight on the exact listing before ordering.
Best ABS Filament 2025
Need heat resistance but not outdoor exposure? Check out our ABS filament guide for indoor engineering parts.
Comparison at a Glance
| Filament | Best Fit | Manufacturer Temperature Guidance | Spool Size | Dimensional Tolerance | Key Tradeoff |
|---|---|---|---|---|---|
| Polymaker PolyLite ASA | General-purpose outdoor parts | 240–260°C nozzle / 75–95°C bed, fan off | Check listing | Not verified | Conservative recommended speed (30–50 mm/s) |
| Prusament ASA | Documented consistency | 260 ± 5°C nozzle / 110 ± 5°C bed | 800 g | ±0.04 mm | Smaller spool; high bed temperature |
| Bambu Lab ASA | Bambu Lab printer owners | Check spool / manufacturer page | Check listing | Not verified | Main advantage only applies in Bambu's ecosystem |
| eSUN eASA | Lower-cost general use | Check listing | Check listing | Not verified | Specs vary by listing; less published documentation |
| SUNLU ASA | Trying ASA on a budget | Check listing | Check listing | Not verified | Expect to tune settings yourself |
"Not verified" means we could not confirm a published manufacturer figure at the time of writing — not that the product performs poorly. Prices are deliberately excluded because they change constantly; compare the current delivered price yourself.
ASA Printing Tips for Success
An enclosure does the heavy lifting
ASA contracts as it cools, so drafts and ambient swings cause lifted corners and split layers. A stable, draft-free chamber improves success rate more than any other single change.
Bed temperature and surface prep
Use the bed temperature your filament manufacturer specifies — these differ significantly between ASA products. Clean the plate, let it heat-soak before starting, and add an adhesive suited to your surface if corners still lift.
Ventilation matters
ASA emits styrene and other volatile compounds while printing. Print in a ventilated space or use an enclosed printer with filtration, and follow the manufacturer's safety guidance for the material.
Go easy on cooling
Strong part cooling is a common cause of weak layer bonding in ASA. Several manufacturers, Polymaker included, recommend running the fan off. Raise it only where overhangs or small details genuinely need it.
ASA vs ABS vs PETG
ASA is not simply a better material than ABS. It is the one you choose when ultraviolet exposure and weathering are the deciding factors. ABS remains a sensible choice for enclosed indoor functional parts, is often cheaper, and takes acetone smoothing well. PETG is far easier to print and fine for sheltered outdoor use, but it is less heat-resistant and not formulated for prolonged UV exposure.
| Property | ASA | ABS | PETG |
|---|---|---|---|
| UV / weather resistance | Formulated for it | Yellows and embrittles | Limited |
| Heat resistance | Similar to ABS | Similar to ASA | Lower |
| Ease of printing | Demanding | Demanding | Straightforward |
| Enclosure | Strongly recommended | Strongly recommended | Optional |
| Typical use | Sun-exposed outdoor parts | Indoor functional parts | General-purpose, sheltered use |
Using ASA for Outdoor Parts
ASA is commonly used for automotive exterior trim and mounts, garden and fence fixtures, brackets, weatherproof electronics enclosures, signage and other functional outdoor components. Choosing ASA is only part of the job, though — how the part is designed and printed matters at least as much as the material.
- • Orientation: layer lines are the weak axis. Orient the part so loads run along layers, not across them.
- • Walls and infill: extra perimeters usually add more real strength than raising infill percentage.
- • Heat: a dark part in direct sun in a parked car gets far hotter than ambient air. Factor that in.
- • Water and freeze-thaw: design so water drains rather than pooling in cavities.
- • Fasteners and load paths: avoid sharp internal corners where cracks start.
A note on safety-critical parts
No filament choice makes a printed part suitable for a structural or safety-critical role on its own. Real-world durability depends on material, print orientation, wall thickness, infill, applied load, heat exposure and environmental conditions. We cannot give lifespan guarantees for any ASA product, and you should not rely on printed parts where failure would cause injury.
Cheapest Quality Filament Bulk Deals
How to compare bulk filament offers on cost per kilogram delivered.
Frequently Asked Questions
What makes ASA useful for outdoor parts?
ASA (Acrylonitrile Styrene Acrylate) is formulated to resist ultraviolet light and weathering better than ABS, which tends to yellow and embrittle in sunlight. It also holds up to heat far better than PLA. That combination is why it is commonly chosen for parts that live outside. It is a material-class characteristic, not a guarantee about any specific spool.
Does ASA need an enclosure?
In practice, yes for most parts. ASA contracts noticeably as it cools, so drafts and ambient temperature swings cause corner lifting and layer splitting. A passive or heated enclosure keeps chamber temperature stable. Small parts sometimes succeed without one, but reliability improves considerably with an enclosure.
Is ASA harder to print than PLA?
Yes. ASA needs higher nozzle and bed temperatures, minimal part cooling, good bed preparation and a draft-free chamber. PLA tolerates almost any setup. If you have never printed ABS or ASA before, expect to spend time on first-layer and adhesion tuning.
ASA or ABS for an outdoor part?
ASA is usually the better pick when the part sees direct sunlight, because it is designed for UV and weather resistance. ABS remains a sensible choice for enclosed indoor functional parts where heat resistance and post-processing matter more than sun exposure. ASA is not simply a better material in every situation.
Does ASA absorb moisture?
ASA picks up moisture from the air like most filaments. Damp filament can print with popping, poor surface finish and weaker layer bonding. Store spools sealed with desiccant, and dry them according to the manufacturer's instructions if prints start showing those symptoms.
What temperatures does ASA need?
Follow the spool manufacturer's published range rather than a generic number. As an example, Polymaker's guidance for PolyLite ASA is roughly 240-260°C nozzle and 75-95°C bed with the cooling fan off, while Prusa states 260 ± 5°C nozzle and 110 ± 5°C bed for Prusament ASA. Ranges differ between formulations.
Is every ASA filament equally UV resistant?
No. UV and weather resistance depends on the base resin, additives, stabilisers and pigments a manufacturer uses, and brands do not publish comparable test data. Treat UV resistance as a property of the specific product, and check what the manufacturer actually claims before relying on it.
How should ASA be stored?
Keep it in a sealed container or vacuum bag with fresh desiccant, away from direct sunlight and heat. If a spool has been open in a humid room for a long time, dry it before an important print using the manufacturer's recommended time and temperature.
How to Choose
- Want a documented, widely available default: Polymaker PolyLite ASA.
- Want published tolerance and per-spool data: Prusament ASA (800 g spools, ±0.04 mm).
- Own a Bambu Lab printer: Bambu Lab ASA, for RFID profile matching.
- Want a lower-cost spool: eSUN eASA or SUNLU ASA — compare delivered price and read the listing's stated settings.
Whichever you pick, the enclosure, bed preparation and cooling settings will influence your results more than the brand on the spool. Get those right first, then compare filaments on the parts you actually print.
