This abstract reports a novel concept for a passive upper limb exoskeleton with 6 degrees of freedom. The device is conceived to support workers in industrial environments in a vast range of repetitive tasks. In this work, leveraging on a detailed analytical model developed in previous research, the best springs configuration to balance the system during the motion is designed through an efficient optimization routine. The model is validated by means of a multi-body tool for specific overhead tasks, and aspects concerning the embodiment design of the proposed balancer are evaluated.