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This video by YouTube channel Brick Experiment where a long gear train is built by using 186 LEGO gears is also a good tutorial on how to calculate a gear ratio [video: buff.ly/33mRjr5]

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3:00 PM · May 20, 2022

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My son just starts and he loves LEGO-Technic - almost tries to build - thank you so much for excitation 😊 !