Getting into the world of Great Ball Contraptions (GBC) can be challenging, especially with the scarcity of certain specialized parts that are no longer in production. These parts are crucial for building and operating a GBC module but could also be useful if you plan to make a MOC with movement! In this article, we explore the essential components and tools you need and the available alternatives to help you start your GBC journey. GBC Balls To build and operate GBC modules, you need LEGO soccer and basketballs which are no longer produced. Genuine LEGO balls, which offer the best reliability, can be expensive, ranging from 1 to 3 Euros/Dollars each on marketplaces like BrickLink. LEGO has recently produced new soccer balls with simpler patterns, offering a more affordable option at 0.5 to 1 Euro/Dollar per ball. These can be purchased from BrickLink or directly from LEGO Pick a Brick. For...













