6 New MOC GBC Mechanical Building Blocks for STEM & Makers

Mechanical building takes LEGO-style construction to another level when gears, linkages, transmission systems, and moving balls are added to the experience.

Our latest MOC GBC mechanical building blocks collection introduces six new modular building sets designed for makers, STEM enthusiasts, mechanical model builders, and anyone who enjoys creating machines that actually move.

From synchronized transmission systems and rotating gears to ball feeders and interactive modules, each set offers a different mechanical challenge—and many can be connected with other GBC modules to create larger, continuously moving systems.

What Is a GBC Mechanical Building System?

GBC, short for Great Ball Contraption, is a type of mechanical building system where small balls are transported through a series of interconnected modules.

Each module can use different mechanisms, including:

• Gears and transmissions
• Linkage mechanisms
• Ball feeders
• Rotating systems
• Lifting and transferring mechanisms
• Hand-crank or motorized drives

The real fun begins when multiple modules are connected together. Instead of building a single static model, you can create a larger mechanical system where each module performs a different function.

Our six new MOC sets are designed around this concept.

1. MOC Cycle Modular Building Block Machine – 928PCS

The first new addition is a 928-piece mechanical building machine featuring an advanced gear system and 12-cycle mechanism.

With its combination of gears and moving mechanisms, this set provides a more advanced building experience for enthusiasts who enjoy mechanical structures.

The modular design allows the mechanism to become part of a larger GBC system, while the drive system can be operated manually or with a motor.

This model is a great starting point if you want to explore how multiple mechanical movements can work together inside a single building set.

2. MOC Family Interactive Building Block Module – 368PCS

The Family Interactive Module offers a more approachable way to explore mechanical building and ball transportation.

With 368 pieces, this module focuses on interactive mechanical movement and ball transfer.

Its compact structure makes it suitable for family building activities, while the mechanical mechanism introduces basic concepts such as motion transmission, rotation, and mechanical coordination.

It can also be combined with other GBC modules to create a more complex mechanical chain.

3. MOC Cycle Mechanical Building Block Module – 1108PCS

For builders looking for a more complex mechanical challenge, the 1108-piece Cycle Mechanical Module adds another layer of gears and linkage mechanisms.

This model uses an advanced combination of gears and linkages to create continuous mechanical movement.

The large number of components allows builders to explore how different mechanical elements interact, making it particularly interesting for experienced MOC builders and mechanical engineering enthusiasts.

If you enjoy understanding why a mechanical system moves—not just watching it move—this type of MOC set provides plenty of opportunities to explore.

4. MOC Synchronized Transmission Building Block Module – 926PCS

The 926-piece Synchronized Transmission Module focuses on coordinated mechanical movement.

Its gear and linkage system creates synchronized motion between different mechanical components.

This makes it a particularly interesting addition to a larger GBC setup, where multiple modules need to work together as part of a continuous mechanical system.

Connect it with other modules and experiment with how different mechanical systems can work together.

5. MOC Ball Feeder Input Module – 381PCS

Every GBC system needs an effective way to introduce balls into the mechanical chain.

The 381-piece Ball Feeder Input Module is designed specifically for this purpose.

Its compact mechanical design allows balls to be fed into a GBC system and transferred toward the next module.

This module can be especially useful when you're building a complete GBC system rather than displaying individual models.

6. MOC Gear Rotation Mechanical Transmission Model – 594PCS

The sixth new product focuses on one of the most fundamental elements of mechanical engineering: gear rotation and transmission.

With 594 pieces, the model demonstrates how rotational movement can be transferred through a mechanical gear system.

It can also be incorporated into a larger GBC setup, allowing builders to experiment with different combinations of modules.

For anyone interested in gears and mechanical motion, this module provides a hands-on way to see transmission principles in action.

Build One Module—or Create an Entire Mechanical System

One of the biggest advantages of these new MOC GBC building blocks is modularity.

You don't have to stop after completing one model.

You can start with an individual module, learn how its mechanism works, and gradually add additional modules to create a larger mechanical system.

For example, a GBC setup could include:

Ball Feeder → Gear Rotation → Synchronized Transmission → Cycle Module → Ball Transfer

Each module performs a different function, while the balls continuously travel through the system.

This makes GBC building more than just assembling bricks. It becomes an exercise in mechanical design, motion, problem-solving, and system integration.

Why Build Mechanical MOC Models?

Mechanical building sets can offer more than a finished display piece.

Learn Mechanical Principles

Gears, linkages, transmissions, rotation, and ball transfer can be explored through hands-on construction.

Develop Problem-Solving Skills

Complex mechanisms require builders to understand how individual components interact and how changes in one part can affect the entire system.

Create Custom Systems

Because the modules are designed around a modular concept, builders can experiment with different combinations and layouts.

Great for STEM Learning

These MOC mechanical building sets can provide an engaging introduction to concepts related to mechanical engineering, physics, motion, and STEM education.

More Than a Static Model

Once completed, the models can actually move, making the building experience continue even after assembly is finished.

Which MOC GBC Module Should You Build First?

Whether you're new to mechanical building or already have experience with GBC systems, there are different ways to approach this collection.

For interactive family building:
Try the 368PCS Family Interactive Module.

For ball feeding and system expansion:
The 381PCS Ball Feeder Input Module is designed to work as an entry point for a larger GBC system.

For gear enthusiasts:
The 594PCS Gear Rotation Module offers a focused mechanical transmission experience.

For more advanced builders:
The 926PCS Synchronized Transmission Module and 928PCS Cycle Modular Machine introduce more complex mechanical interactions.

For the biggest mechanical challenge:
The 1108PCS Cycle Mechanical Module combines a larger number of components with advanced gears and linkage mechanisms.

Start Building Your Own GBC System

These six new MOC mechanical building sets bring together gears, linkages, transmissions, ball feeders, and modular movement in a collection designed for builders who want more than a static model.

Whether you're building one module for your collection or connecting several together to create a larger GBC mechanical system, these sets offer a hands-on way to explore how mechanical components work together.

Build it. Connect it. Watch it move.

Explore the latest MOC GBC mechanical building blocks and start creating your own mechanical system.

Shop the New MOC Collection →