GBC Module Catalog
The most comprehensive listing of Great Ball Contraption modules
Recently Updated Modules
Mini Wave with 3 lanes
Fast Fall (Framed Descent Collection)
Marble Run (Framed Descent Collection)
ZigZag (Framed descent collection)
Yellow Slides
This module only uses pieces in yellow, except for the motor. This includes pins, axles, gears and all other elements.
Yellow Square Screw Ramps
This module only uses pieces in yellow, except for the motor. This includes pins, axles, gears and all other elements.
GBC Gumball Machine
Dot Matrix Counter
Clockwork
Colorful Valley
Aphex Twin Mk II
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.