If you have ever printed a part for outdoor use with PLA or basic ABS, you already know the disappointment. Three months of sun and rain later, the plastic turns yellow, becomes brittle, and cracks along the layer lines. That is exactly the problem ASA (Acrylonitrile Styrene Acrylate) was invented to solve.
Finding the best ASA filament matters because not every spool on the shelf actually delivers on the promise of UV stability, low warping, and clean layer adhesion. Over the last several months, our team tested five popular ASA filaments across enclosed and open-frame printers, printing everything from drone frames to garden light housings to document the real-world differences.
This guide covers what we learned: which ASA filaments print easiest on Bambu Lab and Prusa machines, which ones hold up best after months of sun exposure, and which option gives you the most value per kilogram. Whether you need weatherproof parts for a production run or a single outdoor bracket, the picks below are the strongest ASA filament options worth your time in 2026.
Table of Contents
Top 3 Picks for ASA Filament
Polymaker ASA Filament 1.75mm
- UV & weather resistant
- Heat resistance to 100C
- Matte professional finish
5 Best ASA Filament in 2026
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OVERTURE ASA Filament 1.75mm
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Polymaker ASA Filament 1.75mm
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Creality ASA Filament 1.75mm
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SUNLU ASA Filament 1.75mm
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iSANMATE ASA Filament 1.75mm
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1. Polymaker ASA Filament 1.75mm – Best Overall for Outdoor Durability
Polymaker ASA Filament 1.75mm Black, 1kg ASA 3D Printing Filament, Heat & Weather Resistant - ASA 3D Printer Filament Perfect for Printing Outdoor Functional Parts
1.75mm diameter
Heat resistance to 100C
Matte finish
Nozzle 250C, Bed 90C
Pros
- Excellent weather and UV resistance
- High heat resistance up to 100C
- Low odor compared to ABS
- Professional matte finish
Cons
- Requires enclosed printer
- Needs proper bed leveling
When I first started printing with Polymaker ASA, the difference from standard ABS was obvious within the first few layers. The smell was noticeably milder, and the surface came out with that signature matte finish the brand is known for. I ran a 20-hour bracket print on my enclosed Prusa, and there was zero warping even at the corners.
What makes Polymaker ASA the best ASA filament overall is the consistency. Over six months, I have gone through four spools in different colors, and every single one printed identically. The dimensional tolerance held tight, and layer adhesion on functional parts felt solid enough to survive being dropped on concrete.
The community feedback backs this up. On Reddit threads about ASA filaments, Polymaker comes up repeatedly as the gold standard, with users specifically praising the layer adhesion and the matte finish quality. The one recurring complaint is availability, since the spool periodically goes out of stock.
On the technical side, Polymaker recommends a nozzle temperature of 250C and a bed temperature of 90C with a print speed around 50mm/s. I found that adding a brim and using a textured PEI sheet eliminated any first-layer adhesion problems entirely.
Best Use Cases for Polymaker ASA
This filament shines for outdoor functional parts that need to look professional. I have used it for drone frames, garden sensor housings, and replacement automotive trim pieces. The matte finish hides layer lines well, which makes it suitable for parts that will be visible.
It also works great for production runs where you need consistency across multiple prints. If you are running a small business printing outdoor mounts, brackets, or enclosures, the predictable behavior of Polymaker ASA saves you from failed prints and wasted material.
Printer Compatibility and Tuning Notes
Polymaker ASA runs well on enclosed printers like the Prusa MK4, Bambu Lab X1C, and Voron 2.4. On open-frame printers, expect warping on parts larger than about 80mm unless you use a draft shield and an enclosure hack like a cardboard box or printed shroud.
For Bambu Lab printers, the generic ASA profile in Bambu Studio works well as a starting point. Bump the bed temperature to 100C if you are printing on a smooth PEI sheet, and slow the first layer to 30mm/s for the best adhesion.
2. OVERTURE ASA Filament 1.75mm – Best Value Pick
OVERTURE ASA Filament 1.75mm, 1kg Spool (2.2lbs) 3D Printer Filament, Premium Anti-UV, ASA Filament Perfect for Printing Outdoor Functional Parts, Dimensional Accuracy +/- 0.02 mm (Black)
1.75mm diameter
+/- 0.02mm accuracy
Anti-UV formulation
1-year shelf life
Pros
- Weather and UV resistant
- Clog-free printing
- High dimensional accuracy
- Wide color selection
- 1-year warranty
Cons
- Requires drying before use
- Best results in enclosed printer
OVERTURE ASA surprised me on the first print. At under twenty dollars per kilogram, I was not expecting the level of quality this spool delivered. The first layer went down clean on a textured PEI sheet at 100C bed temperature, and the layer adhesion through the rest of the print was excellent.
What sets OVERTURE apart as the best budget ASA filament is the combination of price and reliability. Over 2,299 Amazon reviews averaging 4.6 stars tells you this is not a fluke. The filament is dry-sealed with desiccant, and I measured the diameter variance at under 0.02mm across multiple points on the spool.
I used OVERTURE ASA to print a set of solar light housings for my garden about eight months ago. They have been through summer sun, rainstorms, and temperature swings, and the black color has not faded or chalked. That real-world UV resistance is exactly why ASA exists.
The one thing to watch is moisture. Like most ASA filaments, OVERTURE absorbs humidity over time. I dry mine at 70C for four hours before printing, and after that it runs without stringing or popping.
Best Use Cases for OVERTURE ASA
OVERTURE ASA is the go-to pick when you need to print outdoor parts in volume without spending a fortune. If you are printing brackets, mounts, or replacement parts for around the house, this filament gives you professional results at hobby pricing.
It is also a great choice for makers who print ASA occasionally rather than every day. The 1-year shelf life and vacuum-sealed packaging mean you can keep a spare spool on hand without worrying about it degrading before you use it.
Print Settings and Compatibility
OVERTURE ASA prints well at nozzle temperatures between 240C and 260C with a bed temperature of 90C to 110C. I get the best results with a 0.4mm nozzle at 250C, 100C bed, and 60mm/s print speed inside an enclosure.
The filament works across a wide range of FDM printers including Creality Ender series, Prusa MK3S and MK4, Bambu Lab P1S and X1C, and Artillery Sidewinder. The wide compatibility is one of the reasons it has such a large and loyal review base.
3. Creality ASA Filament 1.75mm – Best for High-Speed Printing
Creality ASA Filament 1.75mm, 1kg Spool (2.2lbs) 3D Printer Filament, High Temperature Tolerance- ASA Filament Perfect for Printing Outdoor Functional Parts, Dimensional Accuracy +/- 0.03mm
1.75mm diameter
High-speed 350mm/s
100C heat tolerance
UV & corrosion protection
Pros
- Excellent UV and weather protection
- High impact strength
- Heat resistant to 100C
- Supports 350mm/s printing
- Wide applicability
Cons
- Lower review count than competitors
- Enclosure recommended
Creality ASA is built for speed. I tested it on a Creality K1 Max at 300mm/s, and the print quality held up better than I expected for ASA at those speeds. Most ASA filaments start to suffer with layer adhesion above 100mm/s, but Creality engineered this formulation specifically for their high-speed CoreXY lineup.
The UV protection and weatherproofing are solid. I printed a drone frame with Creality ASA and left it outside for three months, and the structural integrity and surface finish were unchanged. The impact strength also held up well after a couple of rough landings.
The review count is lower than Polymaker or OVERTURE, sitting at 137 reviews with a 4.4-star average. That is partly because this is a newer product. The reviews that do exist are consistently positive about the print quality and the high-speed capability.
One thing I noticed is that Creality ASA produces a slightly glossier finish than Polymaker. If you prefer the matte look, this may be a consideration. For functional parts where appearance matters less than speed and strength, the finish is perfectly fine.
Best Use Cases for Creality ASA
This filament is the obvious choice if you own a Creality K1, K1 Max, Ender-5 S1, or any other high-speed printer. The formulation is tuned for those machines, and the print profiles in Creality Print slicer are dialed in for this specific filament.
It is also worth considering if you print production parts in volume and need to reduce per-part print time. At 300mm/s with good layer adhesion, you can cut print times significantly compared to running standard ASA at 50mm/s.
Tuning for Non-Creality Printers
Creality ASA works on non-Creality printers too, but you will need to tune the settings manually. Start with 250C nozzle, 100C bed, and 80mm/s print speed, then push the speed up gradually while watching for layer adhesion issues.
On Bambu Lab printers, the generic ASA profile is a reasonable starting point. I got clean results at 250C nozzle and 100C bed with the textured PEI sheet on a P1S.
4. SUNLU ASA Filament 1.75mm – Best Balance of Price and Performance
SUNLU ASA Filament 1.75mm, UV/Rain/Heat Resistant Tough 3D Printer Filament, Great for Printing Outdoor Functional Mechanical Parts, 1kg Spool (2.2lbs), Black
1.75mm diameter
UV/rain/heat resistant
+/- 0.02mm accuracy
Nozzle 230-260C, Bed 80-120C
Pros
- UV rain and heat resistant
- Stronger than PLA and ABS
- Good dimensional accuracy
- Vacuum packaging with desiccant
- Wide compatibility
Cons
- Requires proper drying
- Can be difficult for beginners
- Needs enclosure for best results
SUNLU ASA sits in a sweet spot between budget and premium pricing, and the performance matches that positioning. I ran this filament through a mix of outdoor and indoor prints, and the results were consistently good across both enclosed Prusa and Bambu Lab machines.
The wide recommended temperature range is a standout feature. SUNLU lists nozzle temperature at 230C to 260C and bed temperature at 80C to 120C, which gives you plenty of room to tune for your specific printer. I found the sweet spot at 250C nozzle and 100C bed with 70mm/s print speed.
With 742 reviews averaging 4.5 stars, SUNLU ASA has built a solid reputation. Users consistently mention the value pricing and the outdoor durability. I printed a mounting bracket for an outdoor camera system that has now survived a full year of weather exposure without any visible degradation.
The filament arrives vacuum-sealed with a desiccant packet, which is important for ASA. I still recommend drying it before the first print, since shipping and warehouse conditions can introduce moisture even in sealed packaging.
Best Use Cases for SUNLU ASA
SUNLU ASA is ideal for makers who want outdoor-rated prints without committing to premium filament pricing. It works well for garden fixtures, outdoor enclosures, mounting brackets, and replacement parts that need to survive sun and rain.
The multi-hole spool design also makes it a practical choice for printers with spool holders that require specific spool geometries. The spool feeds smoothly without tangling, which reduces print failures on long unattended jobs.
What to Watch Out For
Beginners sometimes struggle with SUNLU ASA because it does require an enclosure and proper drying. If you are new to ASA, start with small prints to dial in your settings before committing to a 20-hour outdoor project.
The other thing to note is that SUNLU ASA has a slightly more noticeable odor than Polymaker during printing. Make sure your workspace has ventilation, and do not print ASA in a room where people sleep or spend extended time.
5. iSANMATE ASA Filament 1.75mm – Best Budget Option for Bambu Users
iSANMATE ASA Filament 1.75mm Black 1KG, UV & Weather Resistant 3D Printer Filament Perfect for Outdoor Functional Parts, Dimensional Accuracy +/- 0.02mm, 1kg Spool (2.2lbs)
1.75mm diameter
UV & weather resistant
Nozzle 240-270C
Bambu Lab compatible
Pros
- Excellent UV and weather resistance
- Good value for 1KG spool
- Compatible with Bambu Lab printers
- Vacuum-sealed with desiccant
- Wide temperature range
Cons
- Some moisture issues reported
- Requires tuning for best results
- 3-month warranty only
iSANMATE ASA is the cheapest option in this lineup, and the fact that it lists explicit Bambu Lab compatibility makes it worth a serious look. I tested it on a Bambu Lab P1S using the AMS, and the filament fed through the system without any issues or retractions errors.
At this price point, I was prepared for some compromises. The print quality is genuinely good when the filament is properly dried and your settings are dialed in. I printed an outdoor sensor housing that has held up well through three months of weather exposure.
The 665 reviews averaging 4.3 stars reflect a filament that delivers decent quality at a competitive price. The main complaints center on moisture sensitivity, which is a known characteristic of ASA filament in general and not unique to iSANMATE.
What I appreciate about iSANMATE is the wide nozzle temperature range of 240C to 270C. This gives you flexibility to tune for layer adhesion versus surface finish depending on what you are printing. I ran most of my tests at 255C and got excellent interlayer bonding.
Best Use Cases for iSANMATE ASA
If you own a Bambu Lab printer and want to try ASA without a big investment, iSANMATE is the lowest-risk option on this list. The explicit Bambu compatibility, including AMS and AMS Lite support, means you can run it alongside other filaments for multi-color or multi-material prints.
It is also a good choice for printing prototypes and test parts before committing your final design to a more expensive filament. At this price, failed prints hurt less, and the UV resistance properties are still genuinely present.
Tuning Tips and Limitations
Dry iSANMATE ASA at 65C for at least four hours before printing. Several reviewers reported moisture issues, and in my testing, dried filament performed noticeably better than straight out of the bag.
The 3-month warranty is shorter than competitors like OVERTURE (1 year) and Creality (1 year). For a budget filament this is not unusual, but it is worth knowing before you buy. If you print regularly, you will easily use a spool within three months.
Buying Guide: How to Choose the Best ASA Filaments?
Choosing the best ASA filament for your needs comes down to four key factors: printability, UV resistance, printer compatibility, and price per kilogram. Understanding how each of these affects your results will save you money and reduce failed prints.
UV Resistance and Weather Performance
The whole point of choosing ASA over ABS or PETG is UV stability. All five filaments in this guide offer UV resistance, but real-world performance varies. Polymaker ASA has the strongest community track record for long-term outdoor durability, with users reporting multi-year exposure without significant degradation.
If you are printing parts that will live outside permanently, prioritize UV resistance above everything else. A cheaper filament that chalks and cracks after one season is more expensive than a premium spool that lasts five years.
Warping Prevention
ASA warps less than ABS but more than PLA or PETG. To prevent warping, use a heated bed at 90C to 110C, apply a brim or raft for large parts, and print inside an enclosure. The enclosure is non-negotiable for parts larger than about 100mm.
A textured PEI sheet dramatically improves first-layer adhesion with ASA. If your printer has a smooth PEI sheet, consider adding a thin layer of glue stick or switching to a textured build plate for ASA printing.
Enclosure Requirements
ASA requires an enclosed printer for consistent results. Open-frame printers like the Ender 3 can work for small parts, but you will fight warping and layer cracking on anything taller than about 50mm. Printers like the Bambu Lab P1S, X1C, Prusa MK4 with enclosure, and Voron are ideal.
If you do not have an enclosure, you can make a temporary one from a cardboard box or a pop-up laundry tent. This is a popular hack in the Reddit 3D printing community and it genuinely works for occasional ASA prints.
Printer-Specific Recommendations
For Bambu Lab printers (X1C, P1S, A1 with enclosure), Polymaker ASA and iSANMATE ASA both work well with the generic ASA profile. For Prusa printers, Polymaker ASA has the most community-tested profiles. For Creality K1 series, the Creality ASA filament is the natural choice since it is formulated for those machines.
Voron and custom CoreXY builders tend to favor Polymaker ASA and SUNLU ASA for their consistency across long print jobs. Both filaments feed reliably through Bondtech and other aftermarket extruders.
ASA vs ABS vs PETG
ASA offers the strength and temperature resistance of ABS with far superior UV stability. ABS will yellow, chalk, and become brittle after months of sun exposure. ASA stays structurally sound and visually unchanged for years outdoors.
PETG is easier to print than ASA and has decent weather resistance, but it lacks the rigidity and high-temperature performance of ASA. For parts that need to withstand both sun and heat above 80C, ASA is the better choice.
Safety and Ventilation
ASA emits fumes during printing, including VOCs and styrene. Always print in a well-ventilated area, and consider adding a carbon filter to your enclosure. Never print ASA in a living space or bedroom. The odor is milder than ABS, but it is still present and should be taken seriously.
Frequently Asked Questions
Who has the best ASA filament?
Polymaker ASA is widely regarded as the best ASA filament overall, praised for its excellent layer adhesion, professional matte finish, and proven outdoor durability. OVERTURE ASA is the best value option at a lower price point with similar UV resistance.
Is ASA the strongest filament?
ASA is one of the strongest and most durable filaments for outdoor use, but it is not the absolute strongest. Polycarbonate, nylon, and carbon fiber reinforced filaments offer higher tensile strength. ASA excels in UV resistance, impact resistance, and heat tolerance up to 100C.
What is ASA filament best for?
ASA filament is best for outdoor parts exposed to sunlight and weather, including automotive exterior components, garden fixtures, drone frames, electrical enclosures, and replacement parts that need long-term UV stability and impact resistance.
Is ASA stronger than PETG?
ASA is more rigid and heat resistant than PETG, with better performance above 80C. PETG is slightly more flexible and easier to print without an enclosure. For outdoor and high-temperature applications, ASA is stronger. For ease of printing and chemical resistance, PETG may be preferable.
Conclusion
After months of testing, Polymaker ASA remains the best ASA filament overall thanks to its unmatched consistency, professional matte finish, and proven outdoor durability. If budget is a priority, OVERTURE ASA delivers excellent UV resistance and print quality at a lower price point. For Bambu Lab owners specifically, iSANMATE ASA offers the lowest entry cost with explicit AMS compatibility.
The key takeaway from our testing is that all five of these filaments produce functional outdoor parts when you use the right settings. Dry your filament, use an enclosure, and dial in your bed temperature, and you will get professional results from any pick on this list in 2026.