Abstract: A mounting arrangement (1) for integrating one or more ink jet printheads (6) with an existing primary web or sheet press or the like, the mounting arrangement (1) including a printhead gantry (4) adapted for positioning intermediate the reel stand/splicer (2) and printing unit (3) of the primary press, a mounting carriage (7) fitted to the printhead gantry (4) and adapted to receive and position the printhead (6) to intercept the paper, including cardboard (or other substrates) (5) fed from the reel stand/splicer (2), a drying arrangement (13) adapted to dry the ink jet printing, rollers (10) adapted to intercept and direct the paper feed from the feed roller (2) past the printhead (6) and drying arrangement (13), and a tensioning arrangement to return the ink jet printed paper to the primary press under appropriate tension.