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Heavy Duty Excavator

42121-1·LEGO·2021·116 parts

Used Avg

$38.62

New Avg

$83.28

Add to your inventory Scan the minifigs

About Heavy Duty Excavator

Heavy Duty Excavator (42121-1) is a LEGO LEGO set from 2021 valued at $38.62 on BrickLink. It contains 116 cataloged parts. This set has been retired and is only available on the secondary market.

Seller notes

Sealed copies sell for $83.28 vs $38.62 used — a 116% premium. If you have this set new in sealed box (NISB), price it accordingly.

Parts (116)

Technic, Gear 8 Tooth with Dual Face

×6

Technic, Axle 1L with Pin 2L with Friction Ridges

×7

Slope, Curved 2 x 1 x 2/3

Technic, Liftarm Thin 1 x 5 - Axle Holes

×2

Technic, Panel Fairing #22 Very Small Smooth, Side A

Slope, Curved 2 x 2 x 2/3

×4

Technic, Pin with Friction Ridges and Pin Hole

×5

Plate, Modified 1 x 2 with 1 Stud with Groove and Bottom Stud Holder (Jumper)

Technic, Axle 2L with Pin with Friction Ridges

×12

Technic, Liftarm Thick 1 x 1 (Spacer)

×6

Technic, Liftarm Thick 1 x 1 (Spacer)

×2

Plate, Modified 1 x 2 with Pin Hole on Bottom

×2

Technic Turntable 60 Tooth Bevel, Top

Technic Turntable 60 Tooth, Base

Technic, Axle and Pin Connector Hub with 1L Axle

×7

Technic, Panel Curved 3 x 5 x 3

×3

Technic, Panel Curved 3 x 5 x 3

Technic Digger Bucket 4 x 7

Tile, Modified 1 x 2 Grille with Bottom Groove

×4

Technic, Axle 3L with Stop

×10

Technic, Axle Connector 3L

×3

Technic, Pin with Short Friction Ridges

×40

Technic, Axle and Pin Connector Hub with 2 Axles on Opposite Sides

Plate 2 x 2

Plate 1 x 2

Plate 4 x 6

Tile 1 x 2

×2

Tile 1 x 1

×3

Technic, Brick 1 x 2 with Holes

Technic, Pin 3/4

×5

Technic, Liftarm, Modified Bent Thick 1 x 11.5 Double

×2

Technic, Axle and Pin Connector Angled #1

Technic, Axle and Pin Connector Angled #6 - 90 degrees

×3

Technic, Axle and Pin Connector Angled #2 - 180 degrees

×3

Technic, Pin 3L with Friction Ridges and Stop Bush

×4

Technic, Pin 3L with Friction Ridges and Stop Bush

×6

Technic, Axle 2L Notched

×6

Technic, Liftarm Thin 1 x 6

×4

Technic, Axle 5L

Technic, Liftarm, Modified Bent Thick L-Shape 2 x 4

×6

Technic, Liftarm, Modified Bent Thick L-Shape 2 x 4

×2

Technic, Axle and Pin Connector Perpendicular 3L with Center Pin Hole

×5

Technic, Gear 20 Tooth Bevel

Technic, Axle 5.5L with Stop

Technic, Liftarm, Modified L-Shape Quarter Ellipse Thin 3 x 5

×6

Technic, Gear 20 Tooth Double Bevel

Technic, Gear 12 Tooth Double Bevel

×3

Technic, Liftarm, Modified Bent Thick 1 x 9 (7 - 3)

×4

Technic, Liftarm Thick 1 x 15

×6

Technic, Liftarm Thick 1 x 5

×5

Technic, Liftarm Thick 1 x 3

×5

Technic, Liftarm Thick 1 x 3

×2

Technic, Liftarm Thick 1 x 7

×4

Technic, Liftarm Thick 1 x 7

Technic, Liftarm Thick 1 x 11

×2

Technic, Liftarm Thick 1 x 11

×5

Technic, Liftarm, Modified Bent Thick L-Shape 3 x 5

×3

Technic, Liftarm, Modified Bent Thick L-Shape 3 x 5

×5

Technic, Pin 3L without Friction Ridges

×4

Plate 1 x 3

Technic, Axle 4L

×6

Technic, Axle 6L

Plate 1 x 4

Technic Bush

×2

Technic, Axle 1L with Pin without Friction Ridges with Round Hole

×2

Technic, Link Tread

×90

Technic, Pin Connector Block, Liftarm 1 x 3 x 3

×3

Technic, Liftarm Thick 1 x 9

×4

Plate, Round 1 x 1

×5

Technic, Liftarm Thin 1 x 2 - Axle Holes

×10

Technic, Axle and Pin Connector Perpendicular Double Split

×4

Sticker Sheet for Set 42121 - (72184/6323407)

Technic Bush 1/2 Smooth

×6

Technic, Pin 1/2 without Friction Ridges

×17

Technic, Axle 1L with Pin with Friction Ridges

×14

Technic, Axle and Pin Connector Toggle Joint Smooth

×2

Technic, Axle 7L

Hinge Plate 1 x 2 Locking with 1 Finger on Side without Bottom Groove

Technic, Pin Connector Perpendicular 2 x 2 Bent

×2

Technic, Axle 3L

×13

Cone 1 x 1 with Top Groove

×4

Brick, Modified 1 x 1 with Studs on 2 Sides, Opposite

Technic, Pin Connector Perpendicular 3L with 4 Pins

Slope 30 1 x 1 x 2/3

×2

Hinge Cylinder 1 x 2 Locking with 2 Fingers and Axle Hole on Ends without Slots

Bar with Light Cover (Bulb) / Bionicle Barraki Eye

×2

Technic, Liftarm Thick 1 x 2 - Axle Hole

×20

Technic, Axle 9L

Minifigure, Utensil Hose Nozzle Elaborate

×3

Slope 18 2 x 1 x 2/3 with Grille

×4

Technic, Axle and Pin Connector Block 4 x 3 x 2 1/2 (Linear Actuator Holder)

Technic, Pin Connector Round 2L with Slot (Pin Joiner Round)

×4

Technic, Universal Joint 3L

×4

Technic, Axle and Pin Connector Perpendicular Triple

×2

Technic, Axle and Pin Connector Perpendicular Triple

×4

Technic, Panel Fairing # 4 Small Smooth Long, Side B

Technic, Panel Fairing # 3 Small Smooth Long, Side A

Technic, Axle and Pin Connector Perpendicular

×8

Technic, Axle Connector 2L (Smooth with x Hole + Orientation)

Technic, Pin 3L with Friction Ridges

×63

Technic, Gear 12 Tooth Bevel

Technic, Liftarm Thin 1 x 3 - Axle Holes

×2

Technic, Liftarm, Modified L-Shape Quarter Ellipse Thick 2 x 3

×4

Technic, Liftarm, Modified L-Shape Quarter Ellipse Thick 2 x 3

×2

Tile 2 x 4

Technic, Pin 3L with Friction Ridges and Center Pin Hole

×5

Technic, Axle 4L with Stop

×2

Plate, Modified 2 x 2 with Groove and 1 Stud in Center (Jumper)

×4

Technic Linear Actuator Mini with Dark Bluish Gray Head and Orange Axle

×2

Technic, Axle and Pin Connector Perpendicular Split

Technic, Gear 16 Tooth - Axle Hole with Closed Sides

×4

Tile, Round 1 x 1

×3

Tile, Round 1 x 1

×2

Technic, Liftarm, Modified Triangle Thin 3 x 5 with Short Supports

×4

Common questions about Heavy Duty Excavator

How much is LEGO Heavy Duty Excavator (42121-1) worth?

Heavy Duty Excavator sells for an average of $38.62 used and $83.28 new/sealed on BrickLink based on 6 months of completed sales. As a retired set, prices tend to hold steady or appreciate over time, especially for complete sets with original packaging. Actual prices vary with completeness — missing minifigures or key parts will lower the value.

Is LEGO Heavy Duty Excavator (42121-1) retired?

Yes, Heavy Duty Excavator was released in 2021 and has been retired from retail for several years. Retired LEGO sets are only available on the secondary market through BrickLink, eBay, or other resale platforms.

How do I check if my Heavy Duty Excavator set is complete?

Use the parts list on this page to check every piece. For the minifigures specifically, you can use the brick'em scanner to identify each figure from a photo and confirm it matches what should be in this set. Missing pieces can be individually sourced on BrickLink.

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