MakerBot PLA Filament is the best and most consistent filament for the MakerBot Replicator 2 Desktop 3D Printer. MakerBot PLA Filament is a bioplastic derived from corn. It's guaranteed not to have any heavy metals, phthalates or BPA.Every filament color is comprehensively quality tested at both 100-micron and 200-micron layer resolutions on the MakerBot Replicator 2 to verify that the filament will perform every feature that MakerBot MakerWare software offers and reliably slice and print every type of printing. MakerBot PLA Filament is a good material to start with because it's easy to use and performs well on most prints.MakerBot PLA Filament adheres well to acrylic and to blue painter's tape. Prints with a large bottom layer may have a tendency to curl.