3D Systems 380139 ABS Cube Generation 2 Cartridge, Silver With the easy to load cartridges, installing and switching them out is a breeze - they snap right in Cartridges are designed to prevent material tangles and to be stored away easily Each cartridge is filled with custom ABS plastic, available in multiple color options A chip in the cartridge tells your Cube how much filament is left, so you never run out mid print