Nylon resists scratches and wear, and is often used to create parts that encounter constant friction such as gears or bearings. Nylon parts also won’t crack or shatter when they’re drilled or tapped. Exposure to humidity makes these filaments brittle and unusable, so they need to be stored in a sealed container with a desiccant. Like ECO-ABS, parts can warp during cooling and need a heated printer bed. Make sure your printer is connected to a ventilation system, as nylon emits fumes during printing.