Small Spiral Lift Module
A small spiral GBC module. Unfortunately, this GBC was destroyed long ago and instructions will not be available.
GBC Module Catalog
The most comprehensive listing of Great Ball Contraption modules
Recently Updated Modules
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This module a double sided arm, with pneumatic grabbers that drop down and pick up balls. The highlight of this module...
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Cannon/Shooter v2.1
Rotating module
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.