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LEGO MOC Lego GBC Rotating Cup Module by Sawyer K | Rebrickable - Build with LEGO
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Great Ball Contraption
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WORLD RECORD! LEGO Great Ball Contraption @ Brickworld Chicago 2019 - YouTube
A LEGO Great Ball Contraption That Makes Balls Appear to Move in Orbit Around Planets
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What is a LEGO GBC (Great Ball Contraption)? Review Time-lapse Fire Rescue First Responder to GBC 34 | The Art & Musings of Matt Elder :: mattelder.com
What's a GBC? Start with our building instructions! | PV-Productions