LEGO Mindstorms 51515 Robot Inventor

LEGO Mindstorms 51515, “Robot Inventor”, is a set focused on building and programming modular robots. Released in 2020 under the Mindstorms theme, it contains 949 pieces and reflects the theme’s emphasis on technical experimentation.

Set 51515 “Robot Inventor” belongs to LEGO Mindstorms, a theme built around programmable creations. It is not tied to a story licence and does not represent a single fixed subject. Instead, it provides a robotics platform for constructing technical models with interactive behaviour.

The set includes 949 pieces, with the inventory directed toward sturdy structures, mechanisms and adaptable builds.

It is best suited to builders who want to combine assembly, testing and programming. It can be used for experimental play, functional demonstrations or as part of a Mindstorms collection. Compared with display oriented sets, 51515 is better understood as a programmable toolkit, positioned within its theme as a basis for creating and modifying robot models.

Inventory of set 51515

The inventory of set 51515 lists 949 pieces, spare parts excluded: 145 different lots (one shape in one color) for 129 part shapes. The box also contains 12 spare parts, for small elements that are easy to lose.

Colors of set 51515

Main color: black, making up 39% of the parts, followed by blue (15%) and light bluish gray (13%).

Part types

Most common parts in set 51515

115 of the 129 part shapes in this set have their own page on Setopedia, with their colors, element numbers and the other sets that use them. See all LEGO parts

Exclusive parts in set 51515

One part shape in set 51515 appears in no other set in the catalog, most often a printed element, a sticker or a mold specific to the model. If it gets lost, you will need to look for it individually, for example on BrickLink, rather than in another set. Counting colors, 4 lots in the set are not found in any other set.

Rebuilding set 51515 from another set

Share of the parts of set 51515 found in each of these similarly sized sets, counting shape, colour and quantity:

No similarly sized set goes above 59%: the model relies on a little-shared assortment, most of which has to be gathered piece by piece.

Size of set 51515 within its line

With 949 pieces, it is the largest of the 19 Mindstorms sets in our database, which have an average of 459 parts. Among the 490 sets released in 2020, it ranks #55. That is 2.1 times the average Mindstorms set size.