Acrylonitrile Butadiene Styrene (ABS) is the second most popular 3D printer filament. This thermoplastic is cheap, durable, slightly flexible, lightweight, and it can be easily extruded — which makes it perfect for 3D printing. It’s also the same plastic used in LEGO bricks and bicycle helmets. But there are several disadvantages to using ABS filament, which is why it has fallen a bit from favor in 3D printing. Firstly, it requires a higher temperature to reach melting point, usually in the range of 210°C – 250°C.