GBC Module Catalog
The most comprehensive listing of Great Ball Contraption modules
Recently Updated Modules
Platform Jumper
Straight Shooter
ZigZag
Pick-n-Place
Push Arm
This is a basic pusharm GBC module, designed to show that GBC doesn't need exotic parts. You probably already have all...
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...
Self regulating Pace Setting Reservoir with optional Failure Simulation
This is a self regulating pace setting reservoir running pybricks on Spike Prime or Spike Essentials Hub. The effective...
Two Times Table
Twin lifts with gravity based exit A large passive split inbox with twin lifts that also act as both gates and...
Linkage Crane
Balance
Stepper with a Slide
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.