Engino EB70 Eco Builds Motorized Racers The first innovation of Engino was the wood connectors a range of plastic components which allowed wooden dowels of3/8 x 3/8 inches to connect together without any glue or fasteners. This hybrid system forms the basis of the new Eco builds series which includes 4 starter sets and 2 advanced sets. The biggest set also includes the geared Engino motor for animated models. The use of wood reduces significantly the plastic parts and leads to more efficient recycling making this product an environmentally friendly solution.