This book contains a design for belt-fed green circuit production that outputs 40 circuits per second, or a full blue belt. It also includes a blueprint the same design repeated twice side-by-side, with the second column flipped horizontally so that the combined factory is lane-balanced. Additionally, it includes the doubled-up design repeated five times so that the combined design consumes eight blue belts each of iron and copper plates and produces exactly ten blue belts of circuits, which demonstrates how the design can be tiled.