My next Great Ball Contraption module is the Rainbow Serpentine. The original design was developed by Brian Alano, who had spotted something similar in European GBC loops and made plans of his version available online.  This in turn was modified by Lawrie George, who replaced the large cogs in the centre of the curves with the rotating claw pieces to scoop the balls around the lane. I built my module from Lawrie’s plans, once again in rainbow colours with the parts I had to hand. It handles large numbesr of balls in the input hopper with ease, and translates into a steady flow which exits the module at the top behind the spinners.