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Just like any other design, the blender had to be refined. The first year was full of drive train issues and we constantly had to hammer the aluminum shell back into shape. So the next year we came back with a titanium shell and different drive train, only to find out that our batteries and teeth where not durable enough. So the next year we came back with custom made battery packs and a new tooth design only to find out that our titanium shell was too thin. Without learning these lessons, we would never have been able to develop blender into the machine it is today.