GBC Module Catalog
The most comprehensive listing of Great Ball Contraption modules
Recently Updated Modules
Along the Ring
Along the Ring Type 2
Revenge of Trouble
Another Day in the Mine
Clockwork
Ferris Wheel GBC
This is my train track ferris wheel module. It is built out of two circles of train track connected together by the 64...
Arch Elevator
MOD07 - Batdozer
The Great Ball Of China
MOD10 - Avengers Tower Mark II
MOD03 - Tower Bridge
About the Great Ball Catalog
Great Ball Contraptions (GBC) modules are custom-built LEGO machines that transport small LEGO balls through creative mechanisms.
This catalog is the world’s most comprehensive resource for GBC modules, featuring hundreds of modules from dozens of builders, a lot of them with build instructions. Whether you’re a seasoned builder or just discovering the hobby, you’ll find hundreds of unique designs to explore and build.
Start browsing to discover the amazing variety and ingenuity of the global GBC community.