Both PLA and ABS are different types of filament, or plastic, used by 3D printers to create objects. Each costs roughly the same as the other. ABS is more durable and flexible, but it requires more heat to work during the printing process, and it generates an unpleasant odor. PLA can be used in a 3D printer at a much lower temperature, and it creates a sugar-like odor during printing. Most 3D printers for home use are designed to work with PLA filament.