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This lego GBC (great ball contraption) module uses a conveyor built out of technic engine block pieces to list the balls. It is powered by a lego XL motor and fully meets the GBC standard, infarct it can actually run reliably at almost twice the required speed for the great ball contraption standard, although it runs more reliably at slower speeds. 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 on your own. I hope you like it!