Great Ball Catalog

GBC Module Catalog

The most comprehensive listing of Great Ball Contraption modules

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Bucket-Chain Portal/Bridge

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...

Trophy Stepper

Trophy Stepper

This is the 2021 Brickslopes Workshop Module. Visit the Rebrickable page to get a download link for the instructions....

Classic Space Pinball

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

Cradle Tipper

Simple GBCmodule, very reliable. Probably my most popular module.

Cement Mixer

Cement Mixer

My most mechanically complex module to date. Making use of the big cement barrel from set 42112 Cement Mixer Truck....

Slide Scooper

Slide Scooper

GBCmodule scooping balls up a rotating slide. This module is very suitable to customize to any theme :) All BLUE...

Penguin Slide

Penguin Slide

Fun visual GBC module using the old track parts from set 4588 race track.

Ball Bin Module

Ball Bin Module

Rotor Lift

Rotor Lift

My very first GBCmodule. Designed in haste three days before goring to Skaerbaek Fan Weekend in 2017. Changed very...

The Dumpster

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

Splat Gear Sweeper

GBCmodule designed when the splat gears had just come out. Small and versitile!

The Ball Wheel

The Ball Wheel

GBC Module – The Ball Wheel Inspired by a 16th century book wheel. Updated to V1.1 Only minor error corrections in...

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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.

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