Semaphore
A semaphore indicating if still balls are coming (white circle signal up) or no balls have been seen for more than 35 s...
GBC Module Catalog
The most comprehensive listing of Great Ball Contraption modules
Recently Updated Modules
Great Ball Counter
A counter made of 7segmentdisplays that is easy to ready. Additionally it features a gauge showing the current ball...
GBC Gumball Machine
A reservoir module themed as a gum ball machine. Additionally the output speed can be adjusted from 0 to 60 bps.
Robot Critters
Screw Up!
High Speed Pursuit
Ballkirk Wheel 2.0
GBC-O-Meter
Alien Tow Tug
One Cross Each
This is the fully GBCcompliant version of LBricks (/builder/lbricks/) GBC 48723 (/module/1137/) module
The Ring
Three Lane Drainage Protection Reservoir
This module is constructed to protect subsequent modules from ball drainage by reducing the ball rate in times of low...
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.