The invention relates to a method and apparatus for setting register in a multicolor printing machine having a number of items of equipment for the digital production of color separations, the actions of setting up and combining the color separations being controlled when printing substrates of a different grade are fed in, in order to correct the register setting. The system may include a cabinet made up of a horizontal base, a back, right and left sides, a front, and a top. The heater typically includes one or more of a conductor, a cushion and a separator.