Use the slider to get the modular Arm-Z through the hole without touching the box.
 M. Zawidzki and J. Szklarski, "Transformations of Arm-Z Modular Manipulator with Particle Swarm Optimization," Advances in Engineering Software, 126, 2018 pp. 147–160. doi:10.1016/j.advengsoft.2018.05.003.