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
Designer: Bundy
Get the instructions: Link
Candy Cane Catapult
Designer: JKBrickworks
Get the instructions: Link
F1 Race Car – Mindstorms Robot Inventor
Designer: gubsters
Get the instructions: Link
Wallplotter
Designer: mschulte
Get the instructions: Link
Gyro Inventor
Designer: azya
Get the instructions: Link
Rocket Launcher
Designer: JKBrickworks
Get the instructions: Link
Robot Arm
Designer: JKBrickworks
Get the instructions: Link
Egg-Inventor – Multi-color Egg Decorating Bot
Designer: Bundy
Get the instructions: Link
Tilt Wheeled Vehicle (C-Model)
Designer: jemunoz0
Get the instructions: Link
Lollipop Launcher
Designer: JKBrickworks
Get the instructions: Link
PINGERBEE! – More Than Just Ping Pong
Designer: Bingobricks
Get the instructions: Link
Mindstorms RC Forklift Truck
Designer: Phil83
Get the instructions: Link
Ball-Inventor – Marble Run
Designer: Bundy
Get the instructions: Link
Inventor Writer
Designer: Bundy
Get the instructions: Link
Autonomous F1 Racer
Designer: rusvdw
Get the instructions: Link
Blast Biped Upgrade
Designer: gubsters
Get the instructions: Link
Creamy Caramel Catapult
Designer: JKBrickworks
Get the instructions: Link
Robot Inventor Arm (Danzhilan)
Designer: danzhilan
Get the instructions: Link
BopIt-Inventor – Reaction Game
Designer: Bundy
Get the instructions: Link
Two-Wheeled Vehicle (C-Model)
Designer: jemunoz0
Get the instructions: Link
Windmill from 51515
Designer: Worm65
Get the instructions: Link
Balance Inventor – Balancing Wheelchair
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
