The XD4 is the perfect choice for printing both back and front simultaneously. It achieves this by means of its dual-stacked printing units. It is perfect for paper, cardboard elements, and even flattened tubes. The XD4 is easily operable. Its printhead requires no adjustment, making different material widths no problem; printing on minute, or thick elements is easy; overall print speed is adjustable; and, overall control is integratable with the A+ line.