GBC Module Catalog
The most comprehensive listing of Great Ball Contraption modules
Recently Updated Modules
Sisyphean task
Conveyor vs gravity
Screw It
The Brickworld 2026 Workshop Module.
Compact Cardan Lift
This is the 2019 Brickfair Workshop Module
Mini Catch and Release
This is the 2025 Brickworld Workshop Module.
RFID race
Attention purists: thirdparty parts: esp32 and rfidpettags / Based on an idea of steinepony.
Angry robot rat
Always keep your nest clean.
NAFW
NAFW Not another Ferris Wheel Set 31119 3in1 Ferris Wheel
Pixar lamp GBC module
Made from set 21357
Transstepper Reservoir
Transparent stepper based on pinwheels stepper
Colour catapult
Sorting and shooting.
Slow Counter
A slow and highly precise counter ;)
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.