Here are a couple of videos demonstrating the full design & build process of a pair of Magnetic Paddle Shifters with a Ball Bearings Mechanism.
Design process in Fusion 360: (Including all mechanical parts and commands used)
Build process: (Including 3D Printing, Assembly, Wiring and Testing)
Design process in Fusion 360: (Including all mechanical parts and commands used)
Build process: (Including 3D Printing, Assembly, Wiring and Testing)