Donahue Conveyor
The 2014 Brickworld Workshop Module is the first in a long line of workshop modules from Brickworld Chicago.
GBC Module Catalog
The most comprehensive listing of Great Ball Contraption modules
Recently Updated Modules
Sweeper
This is the 2021 Brickfair Workshop Module
Bricks in the Six 2025
Bricks in the Six 2025 Workshop Module
Hungry Hippos
Whack-a-Ball
A Small Step
A modified variant of a minimal 10x10 stepper based upon Pinwheel's version
Pick and Release Type L
Chaotic Tower in Lime and Black
Fish Hook Loop Conveyor
Chair Lift
Rolling Ball Machine 34
Half Moon Spoon
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.