GBC Module Catalog
The most comprehensive listing of Great Ball Contraption modules
Recently Updated Modules
Coaster Train
Hungry Birds
RJ’s Tensegrity GBC
Step by Step
Bakers Dozen
Squared Spiral V2
Exercise Marble Machine
Flipswitch
Omnidirectional vehicle
Scrambler
Lego GBC Based on a Real Ride
Zig-Zag Thingy GBC
This is a module by a guy named Benjamin (AKA: LEGO Bengineer) and it uses a zigzag sawtooth mechanism to lift balls...
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.