Great Ball Catalog

GBC Module Catalog

The most comprehensive listing of Great Ball Contraption modules

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Recently Updated Modules

Little Drum

Little Drum

REF06 - Mia�s Friendly Wheel

REF06 - Mia�s Friendly Wheel

REF09 - Rotating Truss

REF09 - Rotating Truss

MOD04 - Avengers Tower

MOD04 - Avengers Tower

MOD01 - Compact Reservoir

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...

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Wheel 36

MOD10 - Avengers Tower Mark II

MOD10 - Avengers Tower Mark II

REF07 - Andrea�s Tunnel Of Love

REF07 - Andrea�s Tunnel Of Love

MOD03 - Tower Bridge

MOD03 - Tower Bridge

Birdhouse Ball Pump

Birdhouse Ball Pump

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Geared Rocker

This Is Fine

This Is Fine

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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.

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