30
Part of the GBC standard is accepting batches of up to 30 balls at once but a lot of modules actually fail at doing so...
GBC Module Catalog
The most comprehensive listing of Great Ball Contraption modules
Recently Updated Modules
Mac Pan
GBC module inspired by the original Pac Man arcade cabinet. Successor to the Monkey Pong module, built in the same form...
Bens Znap Module
Little Drum
REF06 - Mia�s Friendly Wheel
REF09 - Rotating Truss
30 (mod)
Monkey Pong
GBC module inspired by the old Donkey Kong Arcade Machine by Nintendo. Can be run as a normal inline module or in...
Sherman Ball Counter
MOD10 - Avengers Tower Mark II
REF07 - Andrea�s Tunnel Of Love
MOD03 - Tower Bridge
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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.