In robotics, price is basically actuator count. Stringman reaches an entire room with four motors, hanging its gripper from lines anchored in the ceiling corners. Working from above, it reaches floors too cluttered for any wheeled or legged robot. And since the lifting force is shared by all motors, payload capacity scales with their combined torque instead of a single actuator's, peaking near the center of the room where the lines share the load most evenly.
*0.75 m serial arm using the same DM-H6215 1 N·m direct drive actuators at rated torque, ignoring the weight of its own links. Stringman figure is for a 7 × 7 × 3 m room at the 28 N line tension limit, net of its 638 g gripper and marker.
