Set Details
- Set Number
- 51515
- Name
- Robot Inventor
- Theme
- Mindstorms
- Year
- 2020
- Pieces
- 949
- Complexity
- Advanced
- Build Time
- 4-8 hours
- Ages
- 14+
- Type
- Educational
About LEGO Robot Inventor
LEGO Robot Inventor (set #51515) is a large, detailed build with 949 pieces from the Mindstorms theme, released in 2020. The Mindstorms line features programmable robotics kits combining bricks with sensors and motors. At 949 pieces, this is a advanced-level build with an estimated build time of 4-8 hours, suitable for ages 14+.
Set Highlights
- 949 pieces at advanced complexity — a 4-8 hours build.
- Compatible with all standard LEGO sets — bricks extend naturally into other sets you own.
- Play-focused build with interactive elements designed for 14+ builders.
Who Is This Set For?
Gift for Ages 14+
The advanced difficulty makes this accessible without being trivial — a well-matched gift for LEGO fans in the 14+ age range.
Weekend Build Project
949 pieces with an estimated 4-8 hours fits comfortably into a focused afternoon or weekend session.
Expanding a Mindstorms Collection
A solid addition for collectors building out their Mindstorms shelf. Introduces parts and builds that complement other sets from the same line.
Build Tips
A five-minute sort by color or piece type before starting saves time hunting for specific bricks mid-step.
Follow the numbered steps in sequence — structural elements early in the build support everything that comes after.
Keep the instruction booklet after building — it's the most reliable reference for disassembly, cleaning, or reassembly after storage.
Finding Instructions
Building instructions for LEGO Robot Inventor (#51515) are available as a free PDF on LEGO.com. You can also upload a photo of this set to LegoFinder to identify it and access the instructions directly.
Robot Inventor FAQ
Related Reading
More Mindstorms Sets
See all Mindstorms →
Also Released in 2020
All 2020 sets →Similar Build Difficulty
Sets at roughly the same piece count and complexity tier — different theme and year, but a similar build experience.
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