A xerographic printing system includes a group of marking modules which apply a marking medium to print media, at least one of the marking modules being a custom marking module. A control system is configured for being operatively linked with marking modules. The printing system has a first mode of operation in which a first plurality of the group of marking modules is operatively linked to the control system and a second mode of operation in which a second plurality of the marking modules is operatively linked to the control system, the second plurality of marking modules including the at least one custom marking module.