LEGO dropped the Robot Inventor (51515) in 2020 as part of the Mindstorms collection — a mid-range build with plenty to enjoy at 949 pieces with a retail price of $359.99.
Price-per-piece sits at $0.379. Not the cheapest, but you're paying for the design and theme licensing.
For the price point, the Robot Inventor delivers a clean Mindstorms build that's easy to recommend.
Key Features
949 pieces — A well-balanced build that hits the sweet spot
$0.379 per piece — Better value than the Mindstorms average
From 2020 — Modern LEGO design and packaging quality
Theme Background
As a 2020 addition to Mindstorms, the Robot Inventor slots into the upper end of the Mindstorms lineup. Mindstorms is part of LEGO's broader product lineup, and at $359.99 this set is priced accordingly. The $0.379 per piece reflects the specialized elements and licensing that come with Mindstorms.
The Mindstorms theme has a broad appeal that crosses over between builders, collectors, and investors. The Robot Inventor fits comfortably into that ecosystem at its price point.
Why This Set Is Special
Largest set in Mindstorms. At 949 pieces, this is the single largest set in the entire Mindstorms theme.
#2 most-wanted in Mindstorms — With 408 collectors wanting this set, it ranks #2 out of 19 Mindstorms sets by demand — top 10.5%.
101% above retail — Now trading at $722.93, up 101% from $359.99 RRP — a 30% annualized return over 2.6 years since retirement.
Part-out value 2.2x retail — The individual parts are worth $802.99 on BrickLink — 2.2x the $359.99 retail price. Exceptional part-out value.
Flagship Mindstorms set — At $359.99, this is the highest-priced set in the Mindstorms theme — flagship sets tend to be the strongest appreciators.
Frequently Asked Questions
[{"q": "How many pieces are in the LEGO Robot Inventor (51515)?", "a": "The LEGO Robot Inventor (51515) contains 949 pieces, making it a mid-range set. This makes it one of the largest sets in the entire Mindstorms theme, ranking #1 out of 19 sets. This set offers a manageable build that can be completed in a sitting or two, making it a good choice for builders of all experience levels."}, {"q": "How much does the LEGO Robot Inventor (51515) cost?", "a": "The retail price (MSRP) for the LEGO Robot Inventor (51515) is $359.99 in the United States. Regional pricing is \u00a3314.99 in the UK, CA$459.99 in Canada, \u20ac359.99 in Europe. This works out to $0.38 per piece. That places it in the top 25% of Mindstorms sets for value \u2014 you get a lot of pieces for the price you pay."}, {"q": "Is the LEGO Robot Inventor (51515) a good investment?", "a": "The LEGO Robot Inventor (51515) shows moderate investment potential based on several factors. Key investment signals include: excellent price-per-piece value. Mindstorms sets have historically been among the best-performing themes for post-retirement appreciation. As with any LEGO investment, buying at or below retail price maximizes potential returns. Use the BrickBucks price tracker to find the best entry point."}, {"q": "What age is the LEGO Robot Inventor (51515) suitable for?", "a": "The LEGO Robot Inventor (51515) is recommended for ages 10+. This strikes a nice balance between complexity and accessibility, suitable for older children and teens building with or without supervision."}, {"q": "Is the LEGO Robot Inventor (51515) still available?", "a": "The LEGO Robot Inventor (51515) retired on July 31, 2023 and is no longer available at retail. You can find this set on secondary markets including Amazon, eBay, and BrickLink. Retired Mindstorms sets often trade at a premium above their original retail price, with demand typically increasing over time as sealed inventory decreases."}, {"q": "Where can I buy the LEGO Robot Inventor (51515)?", "a": "The LEGO Robot Inventor (51515) is retired and only available on secondary markets. Check Amazon, eBay, and BrickLink for current listings. Use the BrickBucks price tracker to compare prices across retailers and find the best deal."}]
