ASA Filament

ASA Filament

If you're printing anything that lives outside or gets exposed to heat and sunlight, PLA won't survive it - it yellows, warps, and loses structural integrity fast. ABS handles heat better but still degrades under UV. ASA is the material you reach for when your print needs to survive the real world.

ASA (Acrylonitrile Styrene Acrylate) is engineered specifically for outdoor and high-stress environments. It holds up against UV exposure, humidity, and high temperatures without the colour fade or brittleness you'd get from other common filaments. If you're making garden fixtures, automotive parts, enclosures, or anything that sits outside long-term, ASA is the right call.

How Does It Compare?

ASA keeps the toughness of ABS and adds genuine weatherability. It also shrinks less during cooling than ABS (around 0.7% versus 1.6%), which helps with dimensional accuracy on functional parts.

PLA is the easiest to print but has the weakest real-world durability. It softens in moderate heat and degrades quickly in sunlight. ABS is tougher and handles heat better, but UV exposure causes it to become brittle and discolour over time.

PETG sits closer to ASA in ease of printing but doesn't match it for UV resistance or heat tolerance. If your part is outdoors for any extended period, PETG is a compromise. ASA isn't.

What to Expect When Printing

ASA isn't as forgiving as PLA, but it's not difficult once your setup is dialled in. A heated bed is required, with the build plate sitting between 90°C and 110°C to prevent the first layer from lifting. An enclosed print chamber set to around 60°C keeps ambient temperature stable and significantly reduces warping, and ventilation or carbon filtration is required: ASA produces fumes during printing.

Keep fan speed low or off entirely during printing. Rapid cooling is the main cause of warping and layer separation with ASA, so resist the urge to run the part cooling fan at full speed. Like most technical filaments, ASA is moisture-sensitive. Store your filament sealed between prints or dry it before printing, and you’ll see a consistent improvement in print quality.

What's Available at Jaycar

Jaycar stocks ASA filament from Sunlu, Elegoo, and eSUN. All three are 1.75 mm and suited to most FDM printers. Whether you're printing one-off outdoor parts or producing functional components that need to hold up long-term, you'll find a reliable option here.

If you're still deciding whether ASA is right for your project, the short answer is: if it's going outside or into a hot environment, it probably is.