GBC Module Catalog
The most comprehensive listing of Great Ball Contraption modules
Recently Updated Modules
REF06 - Mia�s Friendly Wheel
REF09 - Rotating Truss
MOD04 - Avengers Tower
MOD01 - Compact Reservoir
This Compact Reservoir is a modified version of the BW 2018 Ball Pump by Brian Alano. I wanted to build a small...
Wheel 36
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Latest GBC Videos
LEGO GBC at Brickin' for the Pantry hosted by Indy LUG
LEGO GBC at Brickin' for the Pantry hosted by Indy LUG #lego #legogbc #legotechnic
Lego GBC - På Kloss Hold 2025
BrickFair 2025 Great Ball Contraption
LEGO® GBC im Ferienpass Burgdorf vom 4. August 2025
About the Great Ball Catalog
Great Ball Contraptions (GBC) are intricate LEGO machines that transport small balls through creative mechanisms and modules.
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.