GBC Module Catalog
The most comprehensive listing of Great Ball Contraption modules
Recently Updated Modules
Rolling Ball Machine 23
Rolling Ball Machine 24
Rolling Ball Machine 25
Rolling Ball Machine 32
Rolling Ball Machine 33
High Stepper
This is a basic 3stage stepper specifically designed to output balls at a high height. This has been used primarily as...
Yellow Racklift Tower Bridge
This bridge module uses two counterdirectional rack lifts to transport the balls upwards. It features a wide inbox and...
Vintage GBC train
This train module uses the core mechanisms of the "Simple GBC Train (feat. 7722)" by NonsenseWars. Loader and unloader...
Inline Shared Power Ball Bin Stepper
My own version of a typical ball bin stepper especially built for my inline shared power system. Does not accept 30...
Swimming Pool
Inline Shared Power Tri-Wheel
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.