I want to start building a module like GBC Miniloop 01, but when I check the part list some are very hard to find. How should I get started with miniloops?

BTW, I got a very big set, Bucket Wheel Excavator 42055, and wanted to be able to do MOC's based on the parts in there. There are still many parts not included that I need for building this small GBC Mini loop.

Any suggestions?

  • 1
    The parts in the model in that video look pretty generic, it appears to be mostly bricks, which are easily substituted for other colors or even shapes. If you need a quantity of a certain piece, you can try Bricklink. Jul 30, 2017 at 2:43
  • @AlexanderO'Mara thanks. but parts like 3937 rocker bearing 1*2 seems hard.
    – hxd1011
    Jul 30, 2017 at 2:46
  • 1
    Rocker bearing 1*2 appears in nearly 1000 sets brickset.com/parts/design-3937
    – Craig
    Jul 30, 2017 at 10:02
  • 4
    You are in luck. PV Productions has instructions for building a huge GBC setup out of the pieces in the 42055.
    – chicks
    Jul 30, 2017 at 22:57
  • @chicks this saves me a lot of money and time to collect parts and use what i have thanks again !
    – hxd1011
    Jul 31, 2017 at 4:58

1 Answer 1


In answer to your question "I want to build a Great Ball Contraption and have LEGO set 42055, what other LEGO sets do I need to buy?" the answer is: None. You've got all the bits needed, even a motor.

Instructions to make a Great Ball Contraption from LEGO set 42055 are available for purchase for about USD25, and advertisement for the instructions can be see on YouTube. The are other instructions available - like https://www.bricklink.com/v3/studio/design.page?idModel=140147

The PV instructions are just one of dozens of alternative 42055 builds.

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