RFID race
Attention purists: thirdparty parts: esp32 and rfidpettags / Based on an idea of steinepony.
GBC Module Catalog
The most comprehensive listing of Great Ball Contraption modules
Recently Updated Modules
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 ;)
Diagonal in Lime and Black
This module was created because I had a 16x16 plate left over. I have set myself the goal of building a module on...
Great Pinball Contraption
An interactive pinball machine with a built in ball gate that automatically diverts incoming balls to a bypass while a...
Train Track Tower
I assembled this GBC module from various modules and then implemented my own creativity. The basis of the conveyor is...
The Hammer (and The Catcher)
Stuart's Catapult impressed me from the start. But the balls just didn't fly far enough for me. So I built a 2nd...
Moving Platform
This is one of my first GBC MOCs. Build in winter 2021/22. The goal was to create a more or less random output with...
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.