Stitching, folding, spine-forming, and trimming in a single machine. Professional-Looking Books Variable Data and Job Streaming The Océ BLM550+ is a state-of-the-art, in-line booklet-making solution for Océ VarioPrint 6000+ Series monochrome digital presses. It produces high-quality booklets that have the preferred, square-spined appearance of a perfect bound book, yet the security of a stitched spine. They lie flat for easy packing, stacking, and handling.