LEGO SET 51515 - Alternate build | Robot Inventor

LEGO SET 51515 - Alternate build | Robot Inventor

Unleashing Your Inner Engineer: Creative Alternative Builds for LEGO® 51515-1 Robot Inventor

 


The LEGO® 51515-1 Robot Inventor set is much more than a beginner’s introduction to coding and robotics—it’s a treasure trove of possibilities for tinkerers and builders eager to push the boundaries of invention. Armed with 949 Technic elements, four “smart” motors and sensors, and the intuitive LEGO® Mindstorms® coding environment, this set invites you to go beyond the four classic models in the official instructions. Whether you dream of cracking Rubik’s Cubes with a precision-built cube solver, launching candy canes like festive projectiles, or designing your own F1 race car that navigates curves with gyroscopic finesse, the only limit is your imagination.

These community-designed MOCs (My Own Creations) demonstrate how the Robot Inventor’s parts can be re-configured into astonishing new forms. From balancing wheelchairs that defy tipping to wall-drawing plotters that translate your sketches into full-scale art, each alternative build highlights a different facet of engineering creativity. Experimenting with these designs not only sharpens your mechanical skills and coding logic but also encourages problem-solving through rapid prototyping: swap motors, rewire sensors, and iterate on gear ratios until your creation performs flawlessly.

Whether you’re a seasoned roboticist or a curious newcomer, diving into these MOCs will ignite fresh ideas for your next build. In the sections below, explore a curated gallery of standout alternative models—each image links to its detailed instructions, so you can jump straight into building and programming your own custom Robot Inventor masterpiece.


Alternative Builds Gallery

Cube Inventor – Mindstorm 51515 Cube Solver

Cube Inventor
Designer: Bundy
Get the instructions: Link

Candy Cane Catapult

Candy Cane Catapult
Designer: JKBrickworks
Get the instructions: Link

F1 Race Car – Mindstorms Robot Inventor

F1 Race Car
Designer: gubsters
Get the instructions: Link

Wallplotter

Wallplotter
Designer: mschulte
Get the instructions: Link

Gyro Inventor

Gyro Inventor
Designer: azya
Get the instructions: Link

Rocket Launcher

Rocket Launcher
Designer: JKBrickworks
Get the instructions: Link

Robot Arm

Robot Arm
Designer: JKBrickworks
Get the instructions: Link

Egg-Inventor – Multi-color Egg Decorating Bot

Egg-Inventor
Designer: Bundy
Get the instructions: Link

Tilt Wheeled Vehicle (C-Model)

Tilt Wheeled Vehicle
Designer: jemunoz0
Get the instructions: Link

Lollipop Launcher

Lollipop Launcher
Designer: JKBrickworks
Get the instructions: Link

PINGERBEE! – More Than Just Ping Pong

PINGERBEE!
Designer: Bingobricks
Get the instructions: Link

Mindstorms RC Forklift Truck

RC Forklift
Designer: Phil83
Get the instructions: Link

Ball-Inventor – Marble Run

Ball-Inventor
Designer: Bundy
Get the instructions: Link

Inventor Writer

Inventor Writer
Designer: Bundy
Get the instructions: Link

Autonomous F1 Racer

Autonomous F1 Racer
Designer: rusvdw
Get the instructions: Link

Blast Biped Upgrade

Blast Biped Upgrade
Designer: gubsters
Get the instructions: Link

Creamy Caramel Catapult

Creamy Caramel Catapult
Designer: JKBrickworks
Get the instructions: Link

Robot Inventor Arm (Danzhilan)

Robot Inventor Arm
Designer: danzhilan
Get the instructions: Link

BopIt-Inventor – Reaction Game

BopIt-Inventor
Designer: Bundy
Get the instructions: Link

Two-Wheeled Vehicle (C-Model)

Two-Wheeled Vehicle
Designer: jemunoz0
Get the instructions: Link

Windmill from 51515

Windmill
Designer: Worm65
Get the instructions: Link

Balance Inventor – Balancing Wheelchair

Balance Inventor
Designer: Bundy
Get the instructions: Link


With this gallery of alternative builds, you have a roadmap to explore robotics, mechanics, and coding in entirely new ways. Pick your favorite, gather your 51515-1 parts, and start building—then share your own mods with the community to inspire the next generation of creators!

 

Click here for more alternative builds and Modifications for this Lego set

 

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