pair of side bosses 20 22 the bosses extend from a first or closed end 24 of the base to a second or open end 26 accordingly the base defines a cup shaped container having an internal cavity 28 adapted to receive a used or empty printer cartridge e the open end of the base is adapted to receive the disk d the disk has a generally circular outer wall 32 and a generally planar platform 34 individual stations are mounted on the upper surface of the platform and will be described in greater detail below however it should be understood that each station performs an individual step in the refill process and by selectively rotating the disk relative to the base in which the printer cartridge is mounted the individual steps of the refill process may be performed on the printer cartridge received over the disk is a cap 38 which has a latching assembly defined by a pair of downwardly extending legs 40 42 each leg includes a raised area 44 that cooperates with an opening 46 in the bosses 20 22 of the base to provide a snap fit latching connection of the lid i e the cap and disk to the base the legs have some flexibility so that they can be deformed inwardly toward one another for receipt in slots 48 defined in the second end 26 of the base upon continued axial insertion of the lid c the resilient character of these legs urge the raised portions 44 outwardly through openings 46 to lock the lid disk and base together it will be understood however that the disk can still rotate relative to the base when the cap.