Bucket-Chain Portal/Bridge
Large GBC Module to span two tables and create an opening in the GBC circuit. Brigde spans 115 cm (3' 9") and clears...
GBC Module Catalog
The most comprehensive listing of Great Ball Contraption modules
Recently Updated Modules
Trophy Stepper
This is the 2021 Brickslopes Workshop Module. Visit the Rebrickable page to get a download link for the instructions....
Classic Space Pinball
Interactive module i´ve been working on for a while. Inline GBC pinball machine that can be operated by the crowd....
Cradle Tipper
Simple GBCmodule, very reliable. Probably my most popular module.
Cement Mixer
My most mechanically complex module to date. Making use of the big cement barrel from set 42112 Cement Mixer Truck....
Slide Scooper
GBCmodule scooping balls up a rotating slide. This module is very suitable to customize to any theme :) All BLUE...
Penguin Slide
Fun visual GBC module using the old track parts from set 4588 race track.
Ball Bin Module
Rotor Lift
My very first GBCmodule. Designed in haste three days before goring to Skaerbaek Fan Weekend in 2017. Changed very...
The Dumpster
Small technic based GBCmodule. Version 1.1 fixes a flaw there the crank got stuck on the 24gear, also some other...
Splat Gear Sweeper
GBCmodule designed when the splat gears had just come out. Small and versitile!
The Ball Wheel
GBC Module – The Ball Wheel Inspired by a 16th century book wheel. Updated to V1.1 Only minor error corrections in...
Random Module of the Day
Loading...
Latest GBC Videos
Loading latest videos...
About the Great Ball Catalog
Great Ball Contraptions (GBC) are intricate LEGO machines that transport small balls through creative mechanisms and modules.
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.