LEGO 9665 Mechanical Engineering Set

Released 2001 · 322 pieces · Educational and Dacta

LEGO Mechanical Engineering Set (9665) was released in 2001 as part of the Educational and Dacta theme, with 322 pieces. By piece count it sits in the top 12% of Educational and Dacta sets. It was one of 15 Educational and Dacta sets released that year (see them all). Released in 2001, 25 years ago, well past the two-to-three-year run most LEGO sets get, so it is almost certainly out of production.

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• Estimated value: $77 (modelled from piece count, era, and age, not live market data)

Availability: Likely retired (inferred from its release year, not an official retirement date)

Full details, the price breakdown, and the minifigures included are below. Add it to your collection to track what it's worth.

• 24¢ per piece, cheaper per piece than most Educational and Dacta sets

More from 2001

Set data from the Rebrickable database, refreshed daily. Catalog data as of 2026-09-01. Values are this site's estimates, see how they're calculated.

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