Last week, I added more features into our mechanical logic II design. First of all, stiffening edges are employeed to increase the stiffness of the whole structure. Also, this feature somehow improved our mechanical logic's stability. Then a ventral frame was created to boost its stability and flatness. Erenow, the main drawback of our design is its complexity though its robustness could be further improved. For the next week, efforts would be made primarily on reducing the complexity. In addition, I will try to establish the model for actuation force of bistable beam.