The video illustrates locomotion of chains of miniature module for a self-reconfigurable robot. Gaits are evolved and further optimized using hill-climbing. The simulated experiments examine module sizes from 11 microns to 698 microns in radius and chain lengths from 3 to 30 modules. Our results show that scaling affects both the preferred type of gait as well as a chain's overall performance (average velocity). In summary, there is a tradeoff where larger scales face the challenge of overcoming gravity, while smaller sizes face the challenge of staying in contact with the ground and the friction it provides. We show that in between these two extremes lies a "best" module size for given environmental, physical, and engineering constraints.