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Michael O’Keefe, aka nxtstep101, is a veteran of LEGO Great Ball Contraption. For over 10 years, he has been creating robots and GBC modules using LEGO Mindstorms and LEGO Technic. His GBC modules are perfect for beginners as they don’t use a lot of bricks but are very creative and beautiful to see working. My favorite is the Dual Lifting Arms module: simple and clever.
Dual Lifting Arms module from nxtstep101
5 modules from nxtstep101 chained in a full loop
