The glowing green cubepro abs filament cartridge from 3d systems is made to fit the cubepro printer and contains enough filament to produce approximately 30 35 medium prints which 3d systems approximates to be the size of an average mobile phone case cubepro cartridges are designed to snap into the cubepro for easy loading and switching the smart cartridge can tell you how much material you have left and it wont let you start a print if you dont have enoug