Prototype Supply 1.75mm PLA Silver 3D Printing Filament, 1kg (2.2 pounds) 3D Printing Filament, Plastic, PLA, 1.75 mm diameter, 1.0 kg (Net Weight). Powder Blue (Opaque) High quality filament manufactured specifically for professional quality 3D printing. Wide-core spool reduces extrusion difficulty caused by tightly coiled filament. 53-mm (2.1 inch) diameter mounting hole. For Makerbot Replicator (Original and Duo-head), Replicator 2 and Replicator 2X; Afinia H-series; PP3DP Up!-series; Solidoodle 2 and 3; PrintrBot; Deezmaker Bukito; QU-BDRevolution, RPM, OneUp, and TwoUp; and other printers that accept 1.75 mm filament. Recommended specifically for printers without a heated print bed. Works great with Makerbot Replicator, and Replicator 2.