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This lego great ball contraption (GBC) module features a arm mechanism using Mindstorms to lift the balls. I built this module because I wanted it to be easier for people to get into building GBC modules, as it can be quite hard to build your first one by yourself. It is a slow but reliable module, and it can hold the GBC standard of 30 balls at one time. Hope you like it! You can watch it running here: