MakerBot PLA Filament is the best, most consistent, and most tested filament for the MakerBot® Replicator® 2 Desktop 3D Printer.MakerBot PLA Filament is a bioplastic derived from corn. It's guaranteed to have no heavy metals phthalates, or BPA.Each filament color is comprehensively quality tested at both 100-micron and 200- micron layer resolutions on the MakerBot Replicator 2 to verify it will perform every feature that MakerBot® MakerWare™ software offers and reliably slice and print every type of 3D model.If you're new to 3D 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. To prevent curling, use rafts.