ASA Filament

ASA replaces ABS's butadiene component with an acrylate rubber, which gives it dramatically better resistance to UV light and weathering. Mechanical properties — strength, heat resistance, impact toughness — are otherwise close to ABS. It prints at 240–260°C with a hot bed and benefits from an enclosure.

ASA is what automakers and exterior trim manufacturers reach for when they need a UV-stable styrene plastic. In 3D printing it has steadily replaced ABS for outdoor applications.

If a printed part will sit on a deck, a roof, a license plate frame, or a bike handlebar, ASA is the right material. ABS yellows and embrittles within months in direct sun; ASA holds up for years.

ASA also tends to smell less and warp slightly less than ABS, which makes it a more pleasant material to print at home — assuming you have an enclosed printer.

ASA prints almost identically to ABS — same temperatures, same adhesion strategies, same warping behavior at scale. If your printer can do ABS, it can do ASA. The main reason to pick ASA over ABS is end-use environment, not printability.