Great Ball Catalog

GBC Module Catalog

The most comprehensive listing of Great Ball Contraption modules

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Recently Updated Modules

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Geared Rocker

This Is Fine

This Is Fine

Bling Colour Sorter

Bling Colour Sorter

Trophy Stepper

Trophy Stepper

This is the 2021 Brickslopes Workshop Module. Visit the Rebrickable page to get a download link for the instructions.

DoubleGBCube

DoubleGBCube

Pump Module Version 2M

Pump Module Version 2M

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Wheel 36

Pancake Flipper

Pancake Flipper

GBCube (mod)

GBCube (mod)

Reveal Ball Pump V2

Reveal Ball Pump V2

Pump Module Version 3M

Pump Module Version 3M

Ball Pump (XL Version)

Ball Pump (XL Version)

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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.

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