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LEGO Technic Heavy-Duty Excavator 42121 Toy Building Kit; A Cool Birthday or Anytime Gift for Kids Who Enjoy Construction Toys; The 2-in-1 Design Gives Hours More Building Fun, New 2021 (569 Pieces)

4.8 out of 5 stars 2,007 ratings
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  • Whether it’s a birthday, holiday, or ‘just because’ gift, young construction fans will love building and exploring this 2-in-1 LEGO Technic Heavy-Duty Excavator (42121) toy set
  • Packed with realistic features, this digger toy set lets kids see how construction vehicles really work. Check out the moving shovel and arm, plus running belts, just like on a real excavator
  • When kids are ready for a new challenge, the 2-in-1 toy model rebuilds into a tracked tractor with backhoe
  • This cool excavator toy for kids is ideal for boys and girls aged 8 and up who love construction vehicles
  • With the authentic cabin and control panel to explore, it’s easy for kids to imagine life on a construction site with this cool excavator toy
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Product information

Product Dimensions 11.1 x 10.32 x 2.99 inches
Item Weight 1.41 pounds
ASIN B08NFBFRZ9
Item model number 6328597
Manufacturer recommended age 8 years and up
Best Sellers Rank #242,814 in Toys & Games (See Top 100 in Toys & Games)
#7,539 in Toy Building Sets
Customer Reviews
4.8 out of 5 stars 2,007 ratings

4.8 out of 5 stars
Release date March 1, 2021
Manufacturer LEGO

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LEGO Technic Heavy-Duty Excavator 42121 Toy Building Kit; A Cool Birthday or Anytime Gift for Kids Who Enjoy Construction Toys; The 2-in-1 Design Gives Hours More Building Fun, New 2021 (569 Pieces)

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Product Description

Looking for a special gift for kids who love construction toy sets? This 2-in-1 LEGO Technic Heavy-Duty Excavator (42121) toy has plenty of features for hours of creative play. Boys and girls aged 8 and up will enjoy an immersive building challenge before exploring the digger toy's realistic features. Digging, driving, rotating; there's so much to discover in this cool kids' excavator toy. Check out the shovel that moves up and down, plus the movable arm, running belts and rotating body. There’s also a detailed cabin with a driver’s seat and control panel. The set comes with extra LEGO brick ‘stones’ to dig and 4 cones. When it’s time for a new challenge, the model rebuilds into a tracked tractor with backhoe. The LEGO Technic universe offers advanced building toys for LEGO fans ready for their next challenge. With realistic mechanisms, these rewarding sets are a great way to introduce kids to the world of engineering.

Important information

Safety Information

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Top Brand: LEGO

Highly Rated
100K+ customers rate items from this brand highly
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100K+ orders for this brand in past 3 months
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From the manufacturer

42121

Build a mighty machine

This heavy-duty excavator building kit makes the perfect gift for any kid who loves construction toys and big machines.

Construction-site fun

Boys and girls will love creating exciting missions for their heavy-duty excavator, with its many authentic details.

LEGO Technic Heavy-Duty Excavator

42121

Rotating body

See the excavator’s body rotate through 360°.

42121

Maneuver the arm

This model moves like a real excavator.

42121

Construction role play

Raise and lower the shovel to transport the stones.

42121

A new model to build

The model rebuilds into a tracked tractor with backhoe.

42121

Authentic features

See the belt tracks, just like on the real thing.

42121

Working shovel

Role play is easy with the realistic tractor model.

42121

2-in-1 model for even more building fun

Playtime lasts even longer as kids rebuild the excavator model into a tracked tractor with backhoe.

What's in the box

  • LEGO Building Elements

    • Customer reviews

    4.8 out of 5 stars
    2,007 global ratings

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    Customers say

    Customers find the LEGO Technic excavator easy to build with great instructions, and one mentions it demonstrates mechanics during assembly. The toy is super fun to play with, with one customer noting it's good for both boys and girls. Customers appreciate the design, build quality, and functionality, considering it a great gift and offering good value for money. They like the builder value, with one mentioning it comes with lots of cool technic parts.

    AI-generated from the text of customer reviews

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    21 customers mention "Ease of assembly"16 positive5 negative

    Customers find the LEGO Technic excavator easy to assemble, with great instructions to follow, and one customer notes it demonstrates mechanics during the building process.

    "Challenging Lego Technic build project. Was seeking this specific item which is no longer in production...." Read more

    "...great product from lego, everything when together and instruction were great to follow...." Read more

    "...equipment....at age 80 decided to try this Lego kit...loved assembling it and love the finished model...." Read more

    "We gave this to our son for Christmas. You need a lot of patience and time. I would give it to someone that loves Legos...." Read more

    16 customers mention "Fun to build"16 positive0 negative

    Customers find the excavator toy super fun to play with, with one customer noting it's particularly good for active boys.

    "Fun Lego project" Read more

    "...for our children and then our grandchildren and they are always great fun to build...." Read more

    "This is obviously a toy but fun to build. Lego has a number of adult kits that require patience and provide satisfaction upon completion...." Read more

    "...You need to pay attention closely to directions. Overall was a nice toy ." Read more

    13 customers mention "Design"13 positive0 negative

    Customers appreciate the design of the LEGO set, describing it as neat and love the finished model, with one customer noting its nice detailing.

    "What a great Lego set for my Lego enthusiasts!" Read more

    "...age 80 decided to try this Lego kit...loved assembling it and love the finished model. Word of warning for newbies to Lego Technic kits...." Read more

    "Well made and well design. All pieces works well and fit good. Customer service promptly replace missing pieces, easy online and hassle free...." Read more

    "...the way the boom extends and retracts was neat, a little slow, but neat. still" Read more

    13 customers mention "Value for money"13 positive0 negative

    Customers find the construction toy to be good value for money.

    "...Always a worthwhile purchase, especially for children instead of the usual junk toys. Not a bad "toy" for adults too!" Read more

    "...This was a lot less expensive and good exercise for the fingers." Read more

    "Probably my son's favorite Lego set and it was an AWESOME price for what you get...." Read more

    "...Toy Building Kit was a very cool gift for my grandson and the price was good." Read more

    12 customers mention "Builder value"12 positive0 negative

    Customers find this LEGO set to be an amazing kit, with one customer noting it comes with lots of cool technic parts.

    "For the price this is an amazing kit. I am an adult, and bought this for me, and will be buying my 8 year old nephew one as well...." Read more

    "Great choice for any LEGO builder, especially if you like moving parts. Perfect for any boy or girl who loves LEGO." Read more

    "Comes with lots of cool technic parts, really big and awesome model. You get a lot of lego for your money with this one. Value for money." Read more

    "...Easy to build and fun to play with. It's a good beginner set if you don't like the more complicated Technic sets. Recommended." Read more

    11 customers mention "Build quality"11 positive0 negative

    Customers praise the build quality of the excavator toy, describing it as awesome and a great Lego product.

    "Another great product from lego, everything when together and instruction were great to follow...." Read more

    "...Other than that it's a great build, and easy to customize (whether it be a gearbox modification, or a "thumb" as I have added to mine)...." Read more

    "Well made and well design. All pieces works well and fit good. Customer service promptly replace missing pieces, easy online and hassle free...." Read more

    "QUALITY QUALITY QUALITY! ALWAYS GO WITH LEGO BRAND I KNOW SOME STUFF I'S PRICEY SOME IS RESONABLE JUST PICK WISELY AND BITE THE BULLET!" Read more

    10 customers mention "Gift value"10 positive0 negative

    Customers find the toy building block to be a great gift.

    "...Technic Heavy-Duty Excavator 42121 Toy Building Kit was a very cool gift for my grandson and the price was good." Read more

    "make a nice gift, was challenging to put together" Read more

    "Great Birthday gift." Read more

    "Loved this! Super value for the money. Is a very giftable item IMO." Read more

    5 customers mention "Functionality"5 positive0 negative

    Customers are satisfied with the functionality of the toy building block, with one customer specifically mentioning that the pieces work well.

    "Well made and well design. All pieces works well and fit good. Customer service promptly replace missing pieces, easy online and hassle free...." Read more

    "A great product for our 6 year old grandson! A project for him and his dad." Read more

    "Great product - reliable seller..." Read more

    "Great Technic set...." Read more

    Great build
    5 out of 5 stars
    Great build
    If you like legos this is a great build - even though Amazon lost my first order the second one arrived on time
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    Top reviews from the United States

    • ..
      5.0 out of 5 stars Was a lot of fun
      Reviewed in the United States on January 6, 2025
      Color: MulticolorVerified Purchase
      Fun Lego project
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    • Grim Tiki
      5.0 out of 5 stars Great product - reliable seller
      Reviewed in the United States on January 18, 2024
      Color: MulticolorVerified Purchase
      Challenging Lego Technic build project. Was seeking this specific item which is no longer in production. Happy to report I received a new in box item from a reliable seller. Would buy from again.
      Helpful
       Report
    • Kt
      5.0 out of 5 stars Excellent set!
      Reviewed in the United States on January 6, 2024
      Color: MulticolorVerified Purchase
      What a great Lego set for my Lego enthusiasts!
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    • Juniquilt2day
      5.0 out of 5 stars Excavator Review
      Reviewed in the United States on July 16, 2023
      Color: MulticolorVerified Purchase
      This purchase was for my husband who likes to build with Lego's. He has not started building this one yet, but we have purchased many sets for our children and then our grandchildren and they are always great fun to build. Always a worthwhile purchase, especially for children instead of the usual junk toys. Not a bad "toy" for adults too!
      Helpful
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    • ted
      5.0 out of 5 stars its just great
      Reviewed in the United States on February 3, 2025
      Color: MulticolorVerified Purchase
      Another great product from lego, everything when together and instruction were great to follow.All parts were there, With buying from lego all these years, which is a lot, I had just one time that a piece was missing and they send it right away after I contact them.
      Helpful
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    • Catherine
      4.0 out of 5 stars Great birthday gift
      Reviewed in the United States on May 5, 2022
      Color: MulticolorVerified Purchase
      Purchased this as a birthday gift for my 11 year old grandson. He LOVED it and the adults passed it around and said “This is COOL!”
      Helpful
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    • Orion
      5.0 out of 5 stars Easy build for bored hands
      Reviewed in the United States on July 8, 2022
      Color: MulticolorVerified Purchase
      Buyer beware, tracks have a hard time moving on smooth surfaces. Other than that it's a great build, and easy to customize (whether it be a gearbox modification, or a "thumb" as I have added to mine). For those who do NOT know what a thumb is, look up "Excavator with thumb".
      Helpful
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    • rusgc
      5.0 out of 5 stars My Intro to Lego Kits, Chose a Good One to Start
      Reviewed in the United States on August 3, 2021
      Color: MulticolorVerified Purchase
      I love trucks and construction equipment....at age 80 decided to try this Lego kit...loved assembling it and love the finished model. Word of warning for newbies to Lego Technic kits. I just returned my second kit, the Porsche 911 RS racing model. After opening the box I discovered the bags of parts were not numbered in order of the assembly instructions. Apparently lots of Technic assemblers love the extra challenge of sorting through 6 or 7 bags of Lego pieces to find pieces, not me....returned it today, very disappointed. I don't know how to tell which kits have numbered bags, I'm gun shy about ordering more kits without knowing.
      9 people found this helpful
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    Top reviews from other countries

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    • Jesús S.
      5.0 out of 5 stars Excelente producto
      Reviewed in Mexico on February 9, 2022
      Color: MulticolorVerified Purchase
      La verdad muy padre el producto, es bastante entretenido a la hora de armarlo y ya armado se ve super bien, satisfecho al 100.

      (◠‿◕)
      Report
    • VEBeal
      5.0 out of 5 stars Ótimo brinquedo.
      Reviewed in Brazil on February 7, 2022
      Color: MulticolorVerified Purchase
      Ótimo brinquedo. É mais difícil de montar que um lego comum. Por isso, preste atenção a faixa etária. Mas é um brinquedo muito bom, com mecanismos e montagem diferenciada.
      Report
    • Jonathan lambert
      5.0 out of 5 stars Très plaisant à assembler
      Reviewed in Canada on August 20, 2024
      Color: MulticolorVerified Purchase
      Super lego
      Report
    • Richy74
      5.0 out of 5 stars Gute Qualität
      Reviewed in Germany on December 12, 2024
      Color: MulticolorVerified Purchase
      👍👍👍
      Report
    • Bianca E.
      1.0 out of 5 stars Veel te duur
      Reviewed in the Netherlands on October 11, 2024
      Color: MulticolorVerified Purchase
      Let op, ik heb zelf ook niet goed gekeken, maar deze prijs is veel te hoog voor wat je er voor krijgt
      Report