Best ASA Filament Brands 2026
ASA (Acrylonitrile Styrene Acrylate) is the outdoor-ready alternative to ABS — UV-resistant, weatherproof, and mechanically tough. If you're printing parts that live outside, in direct sunlight, or in extreme temperature swings, ASA is the correct material. Here's how the best ASA brands compare in 2026, with settings, use cases, and a clear answer on when ASA beats ABS.
🏆 Quick Answer
Best Overall: Prusament ASA — verified QC, best UV resistance data. Best Value: Polymaker PolyLite ASA — easiest to print, excellent availability. Best for Bambu: Bambu Lab ASA. Budget: eSUN ASA+. EU Pick: Fiberlogy ASA.
Why ASA — And Who Actually Needs It
UV Resistance
ABS yellows and degrades within 3–6 months in direct sunlight. ASA maintains its color, stiffness, and structural integrity for years outdoors. This is ASA's defining advantage — UV resistance is built into the polymer chemistry, not just a coating.
Weather & Heat
ASA has a heat deflection temperature of ~95°C — similar to ABS, far above PLA (~55°C) and PETG (~70°C). It handles hot summer temperatures, temperature swings, rain, moisture, and humidity without deforming or becoming brittle.
Mechanical Toughness
ASA is tough and impact-resistant — similar to ABS but slightly more ductile. It won't become brittle in cold temperatures (down to ~-20°C) and maintains flexibility in scenarios where ABS or PLA would shatter. Good for clips, enclosures, and structural outdoor parts.
ASA is the right material for: outdoor enclosures, garden tool parts, rooftop sensor housings, automotive exterior clips, drone frames, license plate brackets, and any part that sees direct sunlight. For full technical data, read our ASA material profile.
ASA vs ABS: Why ASA Wins for Outdoor Use
ASA and ABS have nearly identical print settings, mechanical properties, and use cases — except UV resistance. That single difference makes ASA the clear choice for outdoor applications.
| Property | ASA | ABS |
|---|---|---|
| UV Resistance | Excellent — color stable for years | Poor — yellows in 3–6 months |
| Heat Resistance (HDT) | ~95°C | ~90°C |
| Warping tendency | Medium (less than ABS) | High |
| Print temperature | 240–260°C | 230–250°C |
| Enclosure needed | Recommended | Strongly recommended |
| Odor while printing | Moderate (similar to ABS) | Moderate to strong |
| Layer adhesion | Good | Very good (with acetone smoothing) |
| Acetone smoothing | Not compatible | Yes — excellent finish possible |
| Price/kg | $18–30 | $15–25 |
| Best for | Outdoor / UV-exposed parts | Indoor / post-processed parts |
Bottom line: If the part goes outside or near a window, choose ASA. If it stays indoors and you want acetone smoothing, ABS is still fine. The price difference is small — ASA is worth the upgrade for any outdoor application. See our full ABS vs ASA comparison for more detail.
Best ASA Filament Brands Ranked (2026)
Prusament ASA
✅ Pros
- Prusa-certified QC — verified spool weight and diameter tolerance (±0.02mm)
- Excellent UV resistance — maintains color and strength after 1000h UV exposure
- Very consistent extrusion across the spool
- Wide color range with vibrant, fade-resistant pigments
- Detailed public datasheet with mechanical and UV data
- Optimized for Prusa MK4S and XL
⚠️ Cons
- Ships from Czech Republic — slower delivery outside EU
- Premium price compared to Chinese brands
- Requires drying before use (hygroscopic)
- Limited availability at local retailers
Best for: Makers who want verified quality, accurate specs, and maximum UV resistance for functional outdoor parts
Polymaker PolyLite ASA
✅ Pros
- Outstanding printability — one of the easiest ASA brands to dial in
- Strong UV resistance with consistent color stability
- Wide color selection and excellent availability worldwide
- Lower warping tendency than most ASA brands
- Good balance of stiffness and toughness
- Polymaker's Jam-Free technology reduces clogging
⚠️ Cons
- Slightly lower mechanical strength than Prusament
- Needs proper storage — absorbs moisture quickly when open
- Diameter tolerance slightly wider than Prusament
Best for: Most makers — best balance of printability, UV resistance, availability, and price
Bambu Lab ASA
✅ Pros
- Factory-tuned slicer profiles for Bambu X1C, P1S, and A1 combo
- Bambu enclosed chamber handles ASA warping effectively
- AMS compatible — multi-color ASA prints possible
- No slicer tuning needed — plug-and-play for Bambu users
- Good UV resistance for outdoor parts
- Consistent quality batch to batch
⚠️ Cons
- Price premium for ecosystem convenience
- Not worth using on non-Bambu printers vs alternatives
- Color range smaller than Polymaker or Prusament
- AMS can cause clog issues with ASA if humidity is high
Best for: Bambu Lab X1C / P1S / A1 Combo users who want zero-setup ASA printing
eSUN ASA+
✅ Pros
- Most affordable ASA on this list with global availability
- ASA+ formula has improved impact resistance vs standard ASA
- Good UV resistance for the price
- Widely available on Amazon with fast shipping
- Consistent enough for most functional outdoor parts
⚠️ Cons
- Diameter tolerance wider than premium brands (±0.05mm)
- More prone to stringing — retraction tuning required
- Color selection limited vs Polymaker
- Less consistent batch-to-batch than Prusament or Polymaker
- Must dry before printing — hygroscopic
Best for: Budget-conscious makers who want ASA for outdoor printing without the premium price
Fiberlogy ASA
✅ Pros
- Polish brand with strong QC and professional track record
- Excellent layer adhesion — near-isotropic part strength
- Good European availability through resellers
- Strong color vibrancy retained after UV exposure
- Low odor formulation vs some competitor ASA brands
⚠️ Cons
- Limited availability outside Europe
- Slightly higher warping tendency than Polymaker PolyLite ASA
- Fewer color options than Polymaker
- Slightly pricier than eSUN for similar performance tier
Best for: European makers looking for a quality mid-tier ASA alternative to Prusament
Hatchbox ASA
✅ Pros
- Hatchbox brand reliability — popular and trusted in the US market
- Good value for North American makers (US-warehoused)
- Reasonable UV resistance for standard outdoor applications
- Easy to find on Amazon with Prime shipping
- Minimal smell compared to some ASA brands
⚠️ Cons
- Limited color selection
- Lower UV resistance data vs Prusament or Polymaker
- Warping can be pronounced on open printers — enclosure strongly recommended
- Less mechanical data publicly available
Best for: US-based makers who want familiar Hatchbox reliability for outdoor ASA parts
Quick Comparison Table
| Brand | Price/kg | UV Resistance | Printability | Availability | Overall |
|---|---|---|---|---|---|
| Prusament ASA | $30 | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐ | EU + US | 9.1/10 |
| Polymaker PolyLite ASA | $22 | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐⭐ | Global | 9.0/10 |
| Bambu Lab ASA | $28 | ⭐⭐⭐⭐ | ⭐⭐⭐⭐⭐ (Bambu) | Global | 8.8/10 |
| eSUN ASA+ | $18 | ⭐⭐⭐⭐ | ⭐⭐⭐ | Global | 7.8/10 |
| Fiberlogy ASA | $26 | ⭐⭐⭐⭐⭐ | ⭐⭐⭐⭐ | EU | 8.5/10 |
| Hatchbox ASA | $20 | ⭐⭐⭐ | ⭐⭐⭐⭐ | US | 7.5/10 |
ASA Print Settings: The Numbers That Matter
ASA is similar to ABS in settings but slightly more forgiving. The most common failure modes are warping and layer delamination — both caused by temperature and cooling issues, not extrusion parameters.
| Parameter | Value | Notes |
|---|---|---|
| Print Temperature | 240–260°C | Start at 245°C — increase to 255°C if you see poor layer adhesion or delamination |
| Bed Temperature | 90–110°C | ASA requires high bed temp — 100–110°C for best adhesion; PEI or garolite work well |
| Enclosure Temp | 40–60°C ambient | Strongly recommended for parts >80mm; mandatory for large flat parts prone to warping |
| Print Speed | 40–60 mm/s | Slower than PLA or PETG — slower speeds improve layer bonding and reduce delamination risk |
| Retraction | 1–2mm (DD) / 4–6mm (Bowden) | Less retraction than ABS — tune carefully, ASA strings at high temp if over-retracted |
| Layer Height | 0.2–0.25mm | Standard layer heights work well — thicker layers improve strength but reduce surface finish |
| Cooling Fan | 0–20% | Zero fan for first 10 layers; max 15–20% for overhangs if needed — excess cooling causes warping |
| First Layer | Slow (20–25 mm/s), high bed temp | Critical — first layer adhesion on ASA requires a very flat, clean bed at full temp |
| Draft Shield | Use on open printers | A single-wall draft shield significantly reduces warping on open printers — add in slicer |
| Drying | 70–80°C for 4–6h | ASA is hygroscopic — dry before printing, especially if stored open or in humid climates |
Critical Tips for Printing ASA Successfully
🌡️ Warping is the #1 failure mode
ASA warps more than PETG and about as much as ABS for large parts. The fix is a combination of: high bed temperature (100–110°C), enclosed build chamber (40–60°C ambient), minimal cooling fan, and first layer with good squish. For open printers, use a draft shield (1–2 walls, full height) in your slicer — it prevents drafts from hitting the print and dramatically reduces warping.
🛏️ Bed surface matters — PEI works well
ASA bonds strongly to textured PEI at 100–110°C. Clean the surface with IPA before each print. Let the bed cool to 50–60°C before removing parts — ASA often releases cleanly as PEI cools and contracts. Avoid removing parts while the bed is hot: ASA can stick so aggressively it damages the PEI sheet. Garolite (G10) is another excellent bed surface for ASA.
💨 Ventilation — ASA emits fumes
Like ABS, ASA emits styrene-based vapors during printing. Print in a well-ventilated space or use a printer with a built-in HEPA/carbon filter (Bambu P1S, Bambu X1C). An enclosure with exhaust filtration is ideal. Don't print ASA in small, unventilated rooms. The smell is less intense than ABS but still present — treat it with the same precautions.
💧 Dry your filament before printing
ASA is hygroscopic. Wet ASA produces visible bubbling in extrusion, poor surface finish, layer delamination, and a popping sound during printing. Dry at 70–80°C for 4–6 hours in a filament dryer or oven before use, especially if the spool has been open for more than a week. See our filament drying guide for full process.
What to Actually Print with ASA
ASA's UV resistance, heat tolerance, and toughness make it the go-to material for functional outdoor and automotive parts. Here are the most common real-world applications.
🌿 Garden & Outdoor
- • Irrigation system clips and fittings
- • Plant labels and markers
- • Garden tool handles and grips
- • Outdoor furniture repair parts
- • Sprinkler head covers
- • Bird feeder components
🚗 Automotive
- • License plate brackets and surrounds
- • Exterior trim clips and fasteners
- • Antenna mounts
- • Mirror brackets
- • Roof rack accessories
- • Cable management for exterior runs
📡 Electronics & Sensors
- • Weather station enclosures
- • Solar panel mount hardware
- • Outdoor security camera mounts
- • IoT sensor housings
- • Drone frames and mounts
- • Rooftop equipment brackets
🏗️ Infrastructure & Structural
- • Mailbox parts and repairs
- • Fence and gate hardware
- • Pool equipment clips
- • Gutter repair components
- • Outdoor signage mounts
- • Marine hardware (not submerged)
Frequently Asked Questions
What is the best ASA filament for 3D printing in 2026?
Prusament ASA is the best overall ASA filament for verified quality and maximum UV resistance — it has publicly documented UV test data that few competitors match. Polymaker PolyLite ASA is the best value option, with excellent printability and wide global availability. For Bambu printer users, Bambu Lab ASA with its pre-tuned profiles eliminates all setup guesswork.
What temperature do you print ASA filament at?
Most ASA brands print between 240–260°C nozzle temperature, with 245–255°C being the typical sweet spot. Bed temperature should be 90–110°C — use the high end (100–110°C) for better adhesion. Fan should be off or very low (0–20%). An enclosure at 40–60°C ambient dramatically reduces warping on larger prints.
Is ASA better than ABS for outdoor use?
Yes — clearly. ASA's UV resistance is its defining advantage: ABS yellows, becomes brittle, and degrades structurally within 3–6 months of UV exposure. ASA maintains its color and mechanical properties for years outdoors. The print settings are nearly identical, and ASA even warps slightly less than ABS. For any outdoor application, ASA is the right choice over ABS. The only reason to choose ABS outdoors is if you specifically need acetone smoothing — ASA is not acetone-compatible.
Does ASA need an enclosure?
ASA benefits significantly from an enclosure, but it's not as strictly mandatory as for ABS or PC. For small parts (under 80mm), many makers print ASA without an enclosure using a draft shield and high bed temperature. For large parts, broad flat surfaces, or multi-hour prints, an enclosure at 40–60°C ambient is strongly recommended. Using a draft shield (1–2 wall perimeter, full height) in Bambu Studio, PrusaSlicer, or Orca Slicer adds significant warping resistance on open printers.
The Bottom Line
ASA is the outdoor maker's material of choice — it combines ABS-like mechanical properties with genuine long-term UV resistance. If you're printing anything that goes outside, ASA is almost always the right call over ABS, PETG, or PLA. The print difficulty is manageable with a high bed temperature, an enclosure or draft shield, and minimal cooling.
- Best Overall: Prusament ASA — verified UV resistance, excellent QC, ideal for functional outdoor parts
- Best Value: Polymaker PolyLite ASA — easiest to print, widely available, strong UV performance
- Bambu Users: Bambu Lab ASA — plug-and-play with X1C / P1S built-in enclosure
- Budget: eSUN ASA+ — most affordable, good for non-critical outdoor applications
- EU Pick: Fiberlogy ASA — strong quality mid-tier option for European makers
Want to compare ASA against other outdoor materials? Read our ASA vs PETG for outdoor use guide, or see our Best Filament for Outdoor Use master guide.