Watch as we guide you through the step-by-step process of creating a smooth, working mechanism that allows a metal ball to slide effortlessly through a LEGO-made track.This easy-to-follow video ...

YouTuber Akiyuki Brick Channel has created some of the wildest Technic LEGO builds we’ve ever seen ... The creator says this is just one of his “great ball contraption” modules, or GBCs.