A compact monochrome ink jet printhead having a staggered high-density arrangement of ink drop generators for high-performance printing. The blow-molded wheels may include a blow-molded body that has a tread surface, first and second sidewalls and an axis. At the same time the other pair of legs with its connecting middle-part is movably attached to the underside of the tabletop. The pneumatic tool drive system gives the operator the freedom to move about his work space free of cumbersome hoses and compressors.