Category: Fan Builds

Szilard Gyalay from the USA build our GBC 51 Gravel Works from the LEGO 42131 CAT D11 Bulldozer set.
We couldn’t be more fond of his review. This is what Szilard had to say:

GBC 51 Gravel Works - 42131 Building Instructions

Szilard Gyalay - October 2, 2023

I believe it is one of the best builds yet, with very stable lift mechanism simple conveyer belt and great use of gravitational forces for the „tilt-drop“ . The wave mechanism needs some tune-up but works well after. Dismantle and build about 8 -10 hours , Worked in the evening. I actually dismantled my CAT11 to build this. YouTube Video https://www.youtube.com/watch?v=YeBVlC0f5K4

He even included a video which can be seen below.
Thanks for sharing with us Szilard! Share your machines as well via our upload form.

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Our GBC 10 Funfair is already 7 years old. The cool thing about LEGO is that you can rebuild anything, anytime you want. So did Jorian from the Netherlands and this is what he wrote us. See also the fan build he send us!

6 years ago I bought and build the GBC 10 Funfair. After that I have sold the LEGO set but recently I got the set again and the first thing I did was to rebuild the GBC 10 FunFair. PV-Productions truly got the most out of this LEGO set and after building you are left with not much parts. Very well done! I also create my own GBC now and I like it a lot! Thanks.

Thanks for sharing this with us Jorian and hearing the nice words!

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Our friends at Toypro wrote a nice article about our latest GBC 51 Gravel Works. A model made from all the parts of LEGO 42131 CAT D11 Bulldozer set.
Check out what they have to say about it and, while you are there, why not get the LEGO set there as well.

So many things are happening, GBC balls are rolling everywhere in the GBC 51 Gravel Works. With 6 modules and lots of paths for the balls to roll over, this GBC has a bit of everything. PV-Productions, the well-known makers of GBC machines (Great Ball Contraptions), have made another great machine. This time from the set 42131 Cat D11 Bulldozer (App-Controlled)…..

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A recent review completely made our day!

Naoko O. from Canada got our GBC 49 Geneva Drive for his son. This little nifty GBC features multiple mechanisms to get the minds intrigued.
This is what Naoko wrote:

GBC 49 Geneva Drive - 42120 Building Instructions

mysteaka - August 18, 2023

I bought this instructions for my son's 7th birthday gift, as he requested.  He is not a big fan of LEGO but really likes GBC videos. He made a few small GBC modules by watching examples from GBC promo videos before, but it was the first time for him to build a GBC module by following building instructions.  With some short breaks, my son took about 8 hours to build the module himself. For him, this was neither too difficult nor too easy, neither too large nor small, but there were a few exciting challenges and lots of fun to build and play.  The instructions were clear and detailed. Timing mechanisms, geneva mechanism, and arms of the caroucel might be more challenging, but they were actually not, because of the detailed "Fine Tuning" section.  On the other hand, the geneva mechanism snagged every round because a large bevel gear connected to a weapon barrel  (#6 on Page 18)  and a small bevel gear under the ratchet mechanism (#13 on Page 24) didn't mesh properly. To solve it, axles/axle-pegs connecting a weapon barrel and shell 3x1x2 technic beams needed to be adjusted by a little poking and prodding, about 0.5 mm or so (Page 19). It was tricky because what he needed to adjust was not the bevel gears themselves but other parts. When my son solved it, he was really excited, looks super happy and proud.  The LEGO Technic 42120 set is a retired product in our country, but I was fortunately able to purchase the 42120 set. Like other PV-Production's instructions, it was really awesome that all the parts came from a single existing LEGO set and we did not have to gather parts up from here and there.  Only if the instruction was printable. It seems that books/prints are still easier for this age group of children to follow instructions. It feels like more than just STEAM learning. It was a big hit and still is. My son wants more PV-Productions' building instructions, and I'd definitely buy.

Thank Naoko for sharing this with us and we hope your son will continue his passion for engineering in the future.

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It is always great to see our passion GBC being featured on the internet. But being it on TV is even more exciting!

Polo and his nephew Arthur (also known from Planet-GBC.com) participated to the French Got Talent show and showed various cool looking GBC modules. It is always very entertaining to watch people seeing GBC for the first time. You don’t have to speak French to see that the judges got very excited over it!

They even used our GBC Funnel XL which you can see on minute 26:48!

Let the video speak for itself here below.

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Jorian Doornenbal from the Netherlands recently build his GBC 27 Pinball Madness Machine in full glory.
This classic keeps you busy as you have an active play during the operation of the GBC. You can flip like a real pinball machine or shoot GBC Balls out so they go back to the top.
A clever mechanism on the left side travels the GBC Balls up via a step/stair mechanism. Do you notice the weird part we used as steps? Yes, those were available in high quantity in this set (LEGO 42076 Hovercraft set).

At the end Jorian even uses our GBC Glow Balls to really get into the mood. How cool!

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