Here comes another LEGO marble run machine masterpiece from Rimo Yaona. The very colorful GBC Ball Rolling Machine 12 is a fantastic LEGO build from this creative Japanese designer featuring three main rotating blocks, each holding two baskets. The GBC balls are falling two by two into these baskets and are doing some rotations. Whenever a basket is meeting the one held by the liftarm nearby, the liftarm it is attached to is twisting 180 degrees, freeing up the transported balls into the next basket. Super reliable, impressive and fun to watch, this LEGO GBC module can be powered manually or via a motor. This LEGO Great Ball Contraption is also very fun to build (it can easily be built with kids) thanks to high-quality building instructions available on Planet GBC. Let’s go on a rotating ride!
Original design by: Rimo Yaona
Number of parts: 2133
Complexity for building: 
Price for Building: €€€€, expensive
GBC Ball Rolling Machine 12, on Rimo Yaona YouTube channel
Ball Rolling Machine 12 on Planet GBC channel:
 | GBC Ball Rolling Machine 12 – from Rimo Yaona
Note: picture illustrating the presented product is given as an indication to help you in your choice and is not contractual |
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GBC Ball Rolling Machine 12 – from Rimo Yaona
Building Instructions + Parts List
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Hi. This looks like a great build and I am going to build it. Do you think it is possible to split it open and ad one or two more sets of buckets? I think it would be an awesome build.
Thanks
indeed, this truly is a great build.
I think this is possible to add one or two more buckets. But there is a lot of torque on the long axle transmitting the rotation to each bucket, so if you decide to extend the length of the module by adding more buckets, I would also recommend strengthening the structure sustaining the long central axle. This should reduce the torque and allow you to have 4,5 or even more buckets (of course, this is the theory 😉 , I have not tried it myself)
Why is this not motorised?
hello OMR, the module can be easily upgraded with a power functions M-motor plugged to a speed regulator. As mentioned to you on Rebrickable, I’ll issue soon as updated version of the instructions explaining how you can perform this upgrade