GBC Module Catalog
The most comprehensive listing of Great Ball Contraption modules
Recently Updated Modules
G.R.A.M
Barrels
This is the 2025 Brickslopes Workshop GBC by Snowy.
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Hoecken
This is the 2024 Brickworld Workshop Module.
Arch Elevator
Simple GBC Train (feat. 7722)
A train module with the goal of being simple for use as a utility module. The cars compatible with the loader and...
Blue Baller
A GBC module lifting regular GBC balls together with Bionicle Spheres. The bigger blue spheres are filtered out before...
Stella
Little Drum
The module consists of a drum with 4 compartiments. In each compartiment there is room for maximum 8 balls. The drum...
Rolling Ball Machine 26
Rolling Ball Machine 27
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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.