Heavy-Duty Excavator (42121-1)

LEGO set 42121-1 Heavy-Duty Excavator - Image 1

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	$160.00

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Set details

Name: Heavy-Duty Excavator
Set number: 42121-1
Year: 2021
Theme: Technic
Number of parts: 569
Number of part types: 116
Age rating: 8+
Retail price: $39.99
Retirement date: 31-12-2022

Price History

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Parts

Browse all 569 parts in set 42121-1 with individual pricing from BrickLink or Brick Owl.

Price source:

Value of parts: $60.32
Pricing information known of 115/116 parts.

	Color	Quantity	Average price	Total	Value
Technic Link Tread with Beveled Edge	Black	90	$0.11	$9.61	90 x $0.11 $9.61
Technic Linear Actuator Mini with Dark Bluish Gray Head and Orange Axle	Light Bluish Gray	2	$3.08	$6.17	2 x $3.08 $6.17
Technic Beam 1 x 15 Thick	Dark Bluish Gray	6	$0.45	$2.72	6 x $0.45 $2.72
Technic Universal Joint 3L [Complete Assembly]	Light Bluish Gray	4	$0.44	$1.76	4 x $0.44 $1.76
Technic Beam 2 x 3 L-Shape with Quarter Ellipse Thick	Yellow	4	$0.43	$1.71	4 x $0.43 $1.71
Technic Turntable Large Type 3 Top, 60 Tooth	Black	1	$1.68	$1.68	1 x $1.68 $1.68
Technic Connector Beam 3 x 3	Black	3	$0.56	$1.68	3 x $0.56 $1.68
Technic Pin Long with Friction Ridges Lengthwise, 1 Center Slot	Blue	63	$0.03	$1.68	63 x $0.03 $1.68
Technic Pin Connector Perpendicular 2 x 2 Bent	Yellow	2	$0.63	$1.25	2 x $0.63 $1.25
Technic Pin with Friction Ridges Lengthwise with No Center Slots	Black	40	$0.03	$1.07	40 x $0.03 $1.07
Technic Beam 3 x 5 L-Shape with Quarter Ellipse Thin	Black	6	$0.17	$1.04	6 x $0.17 $1.04
Technic Beam 1 x 11 Thick	Dark Bluish Gray	5	$0.19	$0.93	5 x $0.19 $0.93
Technic Beam 1 x 2 Thin	Black	10	$0.09	$0.93	10 x $0.09 $0.93
Technic Turntable Large Type 3 Base	Light Bluish Gray	1	$0.88	$0.88	1 x $0.88 $0.88
Technic Gear 8 Tooth [Reinforced]	Dark Bluish Gray	6	$0.13	$0.80	6 x $0.13 $0.80
Technic Beam 1 x 9 Thick	Black	4	$0.20	$0.80	4 x $0.20 $0.80
Technic Beam 1 x 2 Thick with Pin Hole and Axle Hole	Dark Bluish Gray	20	$0.04	$0.80	20 x $0.04 $0.80
Technic Beam 1 x 6 Thin	Yellow	4	$0.19	$0.75	4 x $0.19 $0.75
Technic Gear 16 Tooth Reinforced [New Style]	Light Bluish Gray	4	$0.19	$0.75	4 x $0.19 $0.75
Technic Pin 1/2 without Friction Ridges	Light Bluish Gray	17	$0.04	$0.68	17 x $0.04 $0.68
Technic Axle and Pin Connector Block 4 x 3 x 2 1/2 [Linear Actuator Holder]	Dark Bluish Gray	1	$0.67	$0.67	1 x $0.67 $0.67
Technic Axle and Pin Connector Perpendicular Double Split	Light Bluish Gray	4	$0.15	$0.59	4 x $0.15 $0.59
Technic Pin Connector Hub with 1 Axle	Dark Bluish Gray	7	$0.08	$0.56	7 x $0.08 $0.56
Technic Axle and Pin Connector Angled #6 - 90°	Black	3	$0.19	$0.56	3 x $0.19 $0.56
Technic Pin Connector Hub with 2 Pins with Friction Ridges Lengthwise [Small Squared Pin Holes]	Light Bluish Gray	5	$0.11	$0.53	5 x $0.11 $0.53
Technic Pin Connector Hub with 1 Pin with Friction Ridges Lengthwise [Centered Friction Ridge]	Yellow	5	$0.11	$0.53	5 x $0.11 $0.53
Technic Digger Bucket 4 x 7	Dark Bluish Gray	1	$0.52	$0.52	1 x $0.52 $0.52
Technic Panel Curved and Bent 6 x 3	Yellow	3	$0.17	$0.52	3 x $0.17 $0.52
Technic Axle and Pin Connector Toggle Joint Smooth	Black	2	$0.25	$0.51	2 x $0.25 $0.51
Technic Beam 2 x 3 L-Shape with Quarter Ellipse Thick	Black	2	$0.25	$0.51	2 x $0.25 $0.51
Brick Curved 2 x 2 x 2/3	Yellow	4	$0.12	$0.48	4 x $0.12 $0.48
Technic Axle Pin 3L with Friction Ridges Lengthwise and 2L Axle	Black	12	$0.04	$0.48	12 x $0.04 $0.48
Technic Panel Curved and Bent 6 x 3	Trans-Clear	1	$0.47	$0.47	1 x $0.47 $0.47
Technic Beam 1 x 11 Thick	Yellow	2	$0.23	$0.45	2 x $0.23 $0.45
Technic Beam 1 x 9 Bent (7 - 3) Thick	Black	4	$0.11	$0.43	4 x $0.11 $0.43
Technic Beam Triangle Thin [Type II]	Black	4	$0.11	$0.43	4 x $0.11 $0.43
Technic Pin Connector Round [Slotted]	Black	4	$0.11	$0.43	4 x $0.11 $0.43
Technic Gear 20 Tooth Bevel	Tan	1	$0.41	$0.41	1 x $0.41 $0.41
Technic Axle 3 with Stop	Reddish Brown	10	$0.04	$0.40	10 x $0.04 $0.40
Technic Panel Fairing #22 5L Small Smooth, Side A	Yellow	1	$0.37	$0.37	1 x $0.37 $0.37
Technic Beam 1 x 7 Thick	Yellow	4	$0.09	$0.37	4 x $0.09 $0.37
Technic Axle Pin with Friction Ridges Lengthwise	Blue	14	$0.03	$0.37	14 x $0.03 $0.37
Technic Beam 1 x 5 Thin with Axle Holes on Ends	Black	2	$0.17	$0.35	2 x $0.17 $0.35
Technic Gear 20 Tooth Double Bevel with Axle Hole Type 1 [+ Opening]	Tan	1	$0.35	$0.35	1 x $0.35 $0.35
Technic Axle 3	Light Bluish Gray	13	$0.03	$0.35	13 x $0.03 $0.35
Technic Beam 3 x 5 L-Shape Thick	Black	5	$0.07	$0.33	5 x $0.07 $0.33
Technic Beam 1 x 5 Thick	Black	5	$0.07	$0.33	5 x $0.07 $0.33
Technic Beam 2 x 4 L-Shape Thick	Yellow	6	$0.05	$0.32	6 x $0.05 $0.32
Technic Pin Connector Round 1L [Beam]	Black	6	$0.05	$0.32	6 x $0.05 $0.32
Technic Beam 1 x 11.5 Double Bent Thick	Yellow	2	$0.16	$0.32	2 x $0.16 $0.32
Technic Axle and Pin Connector Perpendicular	Black	8	$0.04	$0.32	8 x $0.04 $0.32
Technic Beam 3 x 5 L-Shape Thick	Yellow	3	$0.09	$0.28	3 x $0.09 $0.28
Equipment Hose Nozzle / Gun with Side String Hole Simplified	Light Bluish Gray	3	$0.09	$0.28	3 x $0.09 $0.28
Technic Axle and Pin Connector Angled #2 - 180°	Black	3	$0.09	$0.28	3 x $0.09 $0.28
Technic Axle and Pin Connector Perpendicular 3L with Centre Pin Hole	Light Bluish Gray	5	$0.05	$0.27	5 x $0.05 $0.27
Technic Beam 1 x 3 Thick	Yellow	5	$0.05	$0.27	5 x $0.05 $0.27
Tile 1 x 2 with Groove	Light Bluish Gray	2	$0.13	$0.27	2 x $0.13 $0.27
Technic Axle and Pin Connector Perpendicular Triple	Light Bluish Gray	4	$0.07	$0.27	4 x $0.07 $0.27
Plate 4 x 6	Yellow	1	$0.27	$0.27	1 x $0.27 $0.27
Technic Gear 12 Tooth Double Bevel	Black	3	$0.08	$0.24	3 x $0.08 $0.24
Technic Driving Ring Connector Smooth [2 rounded and 2 flat side walls]	Light Bluish Gray	3	$0.08	$0.24	3 x $0.08 $0.24
Technic Axle 4	Black	6	$0.04	$0.24	6 x $0.04 $0.24
Technic Beam 1 x 9 Thick	White	1	$0.23	$0.23	1 x $0.23 $0.23
Brick Sloped 18° 2 x 1 x 2/3 with 4 Slots / Grate	Black	4	$0.05	$0.21	4 x $0.05 $0.21
Technic Beam 1 x 3 Thin	Yellow	2	$0.11	$0.21	2 x $0.11 $0.21
Technic Panel Fairing # 4 Small Smooth Long, Side B	Yellow	1	$0.20	$0.20	1 x $0.20 $0.20
Technic Panel Fairing # 3 Small Smooth Long, Side A	Yellow	1	$0.19	$0.19	1 x $0.19 $0.19
Technic Beam 1 x 3 Thick	Black	2	$0.09	$0.19	2 x $0.09 $0.19
Technic Axle Pin 3L with Friction Ridges Lengthwise and 1L Axle	Red	7	$0.03	$0.19	7 x $0.03 $0.19
Technic Axle 9	Light Bluish Gray	1	$0.17	$0.17	1 x $0.17 $0.17
Tile 2 x 4 with Groove	Yellow	1	$0.17	$0.17	1 x $0.17 $0.17
Tile 1 x 1 with Groove	Red	3	$0.05	$0.16	3 x $0.05 $0.16
Technic Pin Long without Friction Ridges, with Anti-Roll Notch	Tan	4	$0.04	$0.16	4 x $0.04 $0.16
Plate Special 2 x 2 with Groove and Center Stud (Jumper)	Red	4	$0.04	$0.16	4 x $0.04 $0.16
Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [2 Lateral Holes, Small Pin Hole]	Red	4	$0.04	$0.16	4 x $0.04 $0.16
Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole]	Light Bluish Gray	6	$0.03	$0.16	6 x $0.03 $0.16
Tile Special 1 x 2 Grille with Bottom Groove	Black	4	$0.04	$0.16	4 x $0.04 $0.16
Technic Axle 2 Notched	Red	6	$0.03	$0.16	6 x $0.03 $0.16
Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced	Yellow	6	$0.03	$0.16	6 x $0.03 $0.16
Light Cover 1 x 1 Round with Internal Bar / Bionicle Barraki Eye	Trans-Orange	2	$0.07	$0.13	2 x $0.07 $0.13
Technic Pin Connector Round 1L [Beam]	Light Bluish Gray	2	$0.07	$0.13	2 x $0.07 $0.13
Plate Special 1 x 2 with Pin Hole Underneath	Black	2	$0.07	$0.13	2 x $0.07 $0.13
Technic Axle and Pin Connector Perpendicular Triple	Black	2	$0.07	$0.13	2 x $0.07 $0.13
Technic Axle and Pin Connector Perpendicular Split	Light Bluish Gray	1	$0.13	$0.13	1 x $0.13 $0.13
Plate Round 1 x 1 with Solid Stud	White	5	$0.03	$0.13	5 x $0.03 $0.13
Technic Pin 3/4	Tan	5	$0.03	$0.13	5 x $0.03 $0.13
Tile Round 1 x 1	Trans-Clear	3	$0.04	$0.12	3 x $0.04 $0.12
Tile Round 1 x 1	Light Bluish Gray	2	$0.05	$0.11	2 x $0.05 $0.11
Technic Beam 1 x 7 Thick	Dark Bluish Gray	1	$0.11	$0.11	1 x $0.11 $0.11
Cone 1 x 1 [Top Groove]	Red	4	$0.03	$0.11	4 x $0.03 $0.11
Technic Pin Connector Hub Perpendicular 3L with 4 Pins (Squared Holes)	Light Bluish Gray	1	$0.09	$0.09	1 x $0.09 $0.09
Hinge Cylinder 1 x 2 Locking with 2 Click Fingers and Axle Hole, 7 Teeth	Black	1	$0.09	$0.09	1 x $0.09 $0.09
Technic Pin Connector Hub with 2 Axles	Dark Bluish Gray	1	$0.09	$0.09	1 x $0.09 $0.09
Technic Brick 1 x 2 [2 Pin Holes]	Black	1	$0.09	$0.09	1 x $0.09 $0.09
Brick Special 1 x 1 with Studs on 2 Sides	Red	1	$0.08	$0.08	1 x $0.08 $0.08
Technic Gear 12 Tooth Bevel	Tan	1	$0.08	$0.08	1 x $0.08 $0.08
Technic Axle and Pin Connector Perpendicular 3L with Centre Pin Hole	Black	1	$0.08	$0.08	1 x $0.08 $0.08
Technic Axle 6	Red	1	$0.08	$0.08	1 x $0.08 $0.08
Technic Bush	Light Bluish Gray	2	$0.04	$0.08	2 x $0.04 $0.08
Technic Axle Pin without Friction Ridges Lengthwise	Tan	2	$0.04	$0.08	2 x $0.04 $0.08
Technic Beam 2 x 4 L-Shape Thick	Black	2	$0.04	$0.08	2 x $0.04 $0.08
Technic Axle 7	Yellow	1	$0.07	$0.07	1 x $0.07 $0.07
Technic Axle and Pin Connector Angled #1	Black	1	$0.07	$0.07	1 x $0.07 $0.07
Plate 1 x 4	Yellow	1	$0.07	$0.07	1 x $0.07 $0.07
Plate 1 x 3	Red	1	$0.07	$0.07	1 x $0.07 $0.07
Brick Curved 2 x 1 No Studs [1/2 Bow]	Red	1	$0.07	$0.07	1 x $0.07 $0.07
Hinge Plate 1 x 2 Locking with 1 Finger on Side, without Groove	Black	1	$0.07	$0.07	1 x $0.07 $0.07
Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper)	Black	1	$0.05	$0.05	1 x $0.05 $0.05
Plate 2 x 2	Black	1	$0.05	$0.05	1 x $0.05 $0.05
Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope)	Black	2	$0.03	$0.05	2 x $0.03 $0.05
Technic Axle 4 with Stop	Dark Bluish Gray	2	$0.03	$0.05	2 x $0.03 $0.05
Technic Axle Connector Smooth [with x Hole + Orientation]	Yellow	1	$0.04	$0.04	1 x $0.04 $0.04
Technic Axle 5	Light Bluish Gray	1	$0.04	$0.04	1 x $0.04 $0.04
Plate 1 x 2	Yellow	1	$0.04	$0.04	1 x $0.04 $0.04
Technic Axle 5.5 with Stop [Rounded Short End]	Dark Bluish Gray	1	$0.03	$0.03	1 x $0.03 $0.03

Missing pricing information on the following items.

Part		Color	Quantity
	Sticker Sheet for Set 42121-1	[No Color/Any Color]	1

Compare the value of buying Heavy-Duty Excavator as a complete set versus the total value of all parts individually.

BrickLink

Ratio: what the parts sell for, over what the set sells for. Above 1× the parts are worth more than the set.

New · 6 months ?

Set ? · parts $59.82

Used · 6 months ?

Set ? · parts $43.40

Brick Owl

New · Current 0.87×

Set $86.12 · parts $74.67

New · 6 months ?

Set ? · parts $60.05

New · 1 year ?

Set ? · parts $60.32

Used · Current 1.03×

Set $52.37 · parts $53.69

Items sold, 6 months, new, both marketplaces ?

BrickLink
Condition	Timespan	Avg price	Items sold	Inventory value	Ratio
New	6 months	?	?	$59.82	?
Used	6 months	?	?	$43.40	?

Brick Owl
Condition	Timespan	Avg price	Inventory value	Ratio
New	Current	$86.12	$74.67	0.87
	6 months	?	$60.05	?
	1 year	?	$60.32	?
Used	Current	$52.37	$53.69	1.03

Combined 6 Month Sales Volume (New)
Total items sold	?

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.

See how an excavator works
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.

A rewarding build for young LEGO fans
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.

Whether it’s a birthday, Christmas, 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.
Role-play is easy with this cool set. There are 4 cones to manage the building site, plus extra LEGO® pieces to use as bricks for scooping up with the digger truck toy.
This kids' excavator toy model measures over 9 in. (23 cm) high, with arm up,14.5 in. (37 cm) long, with arm fully extended, and 4 in. (11 cm) wide.
The LEGO® Technic™ universe opens up the world of engineering for young LEGO fans ready for their next building challenge.
LEGO® components meet stringent industry standards to ensure they are consistent, compatible and connect reliably every time – it's been that way since 1958.
LEGO® components are dropped, heated, crushed, twisted and analyzed to make sure they meet strict global safety standards.

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Brick Owl and eBay marketplace offers.

BrickLink history of 0 sales with 0 total item quantity. Item condition: New.

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