The Great Ball Contraption Wiki

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A GBC Collaboration

Welcome to The Great Ball Contraption Wiki, a part of the Brickimedia network!

What is a Great Ball Contraption?

A great ball contraption (GBC) is a machine which receives soccer balls or basketballs from one module and passes them to another module, rather like a bucket brigade. Modules built according to the GBC standard can be assembled into a collaborative display without pre-planning or modification. The GBC standard is minimal, permitting the builder great flexibility in designing the mechanism by which balls are moved from the input to the output. The otherwise pointless handling of balls, and the myriad ways this is accomplished, gives great ball contraptions the impression of a Rube Goldberg machine.

a stair stepper module

Upcoming GBC Events

North America


  • På kloss hold, Trondheim, N, April 1-2, 2017
  • Brick Mania Wetteren, Wetteren, B, April 15-16, 2017
  • Bouwen en zo, De Tamboer, Hoogenveen, NL, April 29-30, 2017
  • Kinderboerderijdag, Kinderboerderij, Oss, NL, May 28, 2017
  • Fanweekend Portugal, Paredes de Coura, P, June 9-11, 2017
  • Absolut Steinchen, Hoch Schule Rhein Bonn Sieg, Sankt Augustin, D, June 17-18, 2017
  • Fana’Briques, Rosheim, F, June 30 - July 2, 2017


  • [1] Brickvention, Melbourne, Australia. January 13-15 2017. We may be able to beat Brisbane's record!

See also Past Events.


Contributing QR Code
The Great Ball Contraption Wiki is your web site! Add the GBC content you want to see. We are kindly hosted by Brickimedia, so your Brickimedia account is all you need. How you can make this site better:
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Newly updated forums



Latest reply

Power Function Servo motors...

Posted by Maico on 30 January 2017 at 12:51.
Forum: Great Ball Contraption > Customs

2 95 On 23 March 2017 at 21:09
by Maico

Where to buy components in Ontario, Canada?

Posted by on 14 March 2017 at 15:16.
Forum: Great Ball Contraption > Great Ball Contraption Discussion

1 55 On 15 March 2017 at 06:11
by Captainowie

Lowering the barrier to entry

Posted by ALittleSlow (administrator) on 26 March 2015 at 00:07.
Forum: Great Ball Contraption > Great Ball Contraption Discussion

7 1354 On 9 March 2017 at 21:18
by Maico