Heavy-Duty Excavator

Heavy-Duty Excavator (42121-1) is a set in the Technic theme, released in 2021. It has 569 pieces.

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Number:42121-1
Released:March 2021
Pieces:569
Box size:28.2 × 26.2 × 7.6 cm
Theme:Technic

Box size and weight as measured by Brickset.

In numbers

Over the last 30 days the lowest shop price recorded for this set was 178.07 USD, taken from 30 days with a price on record.

Since 9/25/2026 the lowest shop price has fallen from 182.44 USD to 179.44 USD, by 2 % (based on 40 days with a price on record).

LEGO planned to retire this set in December 2022.

Product details

Number: 42121-1
Name: Heavy-Duty Excavator
Theme: Technic
Released: March 2021
Launched: March 2021
Retired: October 2022 in the United States
Pieces: 569
RRP: ≈ 35.59 USD (49.99 CAD) (Canada)≈ 44.92 USD (39.99 EUR) (Germany)≈ 46.34 USD (179.99 PLN) (PL)≈ 46.89 USD (34.99 GBP) (United Kingdom)39.99 USD (United States)
Price per piece: ≈ 0.063 USD (0.088 CAD) (Canada)≈ 0.079 USD (0.070 EUR) (Germany)≈ 0.081 USD (0.316 PLN) (PL)≈ 0.082 USD (0.061 GBP) (United Kingdom)0.070 USD (United States)
Best price (30 days): 178.07 USD
Price per piece (best offer): 0.315 USD

≈ marks a price converted into this currency at the ECB reference rate of its own date — a reference indication, not a tradeable rate. The price as observed follows in brackets.

BrickLink market data

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View the price guide on BrickLink

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Pricing

Best price ever≈ 178.07 USD (159.99 EUR) Advertising Sealed · gross · idee+spiel · seen 10/29/2026 Not compared yet, no exchange rate: 29 in other currencies

Current best offer≈ 179.44 USD (159.99 EUR) Advertising Sealed · gross · idee+spiel · seen 11/3/2026

Price history

Lowest shop price now179.44 USD
Lowest ever 178.07 USD

Each day's lowest price among the shops' current offers, including VAT. A price in another currency is converted at the ECB reference rate of its day.

Monthly lows as a table

Month	Lowest price
November 2026	178.74 USD
October 2026	178.07 USD
September 2026	181.67 USD

≈ marks a price converted into this currency at the ECB reference rate of its own date — a reference indication, not a tradeable rate. The price as observed follows in brackets.

Price statistics by condition

Nobody has sold this set recently.

Sources idee+spiel: 45 · Data in Brief: 29

Latest price from each shop

Sorted: lowest price first Show highest first

Countries (all)

Show prices for

Germany (DE)

Poland (PL)

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What each source tells us:

Shops: the country they are in, and a delivery within it. None says whether it delivers abroad.
LEGO's own shops: one storefront per country, each delivering within its country.
Hugendubel: in Germany, delivering to Germany and to Austria.
eBay: the country the item is in, and a delivery within the country of the eBay site it is listed on.
BrickLink: averages over sellers worldwide - no seller's country and no delivery.

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idee+spiel Sealed · gross · seen 11/3/2026

≈ 179.44 USD (159.99 EUR)

Go to shop

Data in Brief Sealed · gross · sold 6/1/2023

269.00 PLN

Go to shop

Amazon.com BrickDb shows no Amazon prices. The link opens a search for this set on Amazon's own site.

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Where these prices come from

On eBay

The cheapest eBay listings we saw in the last seven days. They are sellers' asking prices, so they are not in the shop price list or the best offer.

We have not seen a current eBay listing for this set.

Recommended retail price

What LEGO published as the recommended retail price, market by market, in that market's own currency. No market's price is ever derived from another's.

Canada ≈ 35.59 USD (49.99 CAD) unknown tax basis Available 3/1/2021 to 10/23/2022.Recorded by BrickDb since 10/2/2026

Germany ≈ 44.92 USD (39.99 EUR) gross Available 3/2/2021 to 11/22/2022.Recorded by BrickDb since 10/2/2026

PL ≈ 46.34 USD (179.99 PLN) gross No availability dates published.Recorded by BrickDb since 10/21/2026

United Kingdom ≈ 46.89 USD (34.99 GBP) gross Available 3/1/2021 to 11/21/2022.Recorded by BrickDb since 10/2/2026

United States 39.99 USD net Available 3/1/2021 to 10/23/2022.Recorded by BrickDb since 10/2/2026

≈ marks a price converted into this currency at the ECB reference rate of its own date — a reference indication, not a tradeable rate. The price as observed follows in brackets.

Light kits for this set

LED lighting made to fit this set, sold by a partner shop. The price is the shop's own for its cheapest version, including VAT; delivery is extra.

20% off with the code BRICKDB20

Light Kit for Heavy-Duty Excavator 42121 from 26.99 EURSold by Game of Bricks · price read 11/3/2026

AdvertisingView at Game of Bricks

Building instructions

All building instructions for this set on LEGO.com

Parts in this set

131 inventory lines

Catalogue image of the part Technic Gear 8 Tooth [Reinforced]

Technic Gear 8 Tooth [Reinforced] 10928· Dark Bluish Gray

×6

Catalogue image of the part Technic Axle Pin 3L with Friction Ridges Lengthwise and 1L Axle

Technic Axle Pin 3L with Friction Ridges Lengthwise and 1L Axle 11214· Red

×7

Catalogue image of the part Brick Curved 2 x 1 No Studs [1/2 Bow]

Brick Curved 2 x 1 No Studs [1/2 Bow] 11477· Red

×1

Catalogue image of the part Technic Beam 1 x 5 Thin with Axle Holes on Ends

Technic Beam 1 x 5 Thin with Axle Holes on Ends 11478· Black

×2

Catalogue image of the part Technic Panel Fairing #22 5L Small Smooth, Side A

Technic Panel Fairing #22 5L Small Smooth, Side A 11947· Yellow

×1

Catalogue image of the part Brick Curved 2 x 2 x 2/3

Brick Curved 2 x 2 x 2/3 15068· Yellow

×4

Catalogue image of the part Technic Link Tread with Beveled Edge

Technic Link Tread with Beveled Edge 15379· Black

×86

Catalogue image of the part Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper)

Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper) 15573· Black

×1

Catalogue image of the part Technic Gear 20 Tooth Double Bevel with Axle Hole Type 1 [+ Opening]

Technic Gear 20 Tooth Double Bevel with Axle Hole Type 1 [+ Opening] 18575· Tan

×1

Catalogue image of the part Technic Axle Pin 3L with Friction Ridges Lengthwise and 2L Axle

Technic Axle Pin 3L with Friction Ridges Lengthwise and 2L Axle 18651· Black

×12

Catalogue image of the part Technic Pin Connector Round 1L [Beam]

Technic Pin Connector Round 1L [Beam] 18654· Black

×5

Technic Pin Connector Round 1L [Beam] 18654· Light Bluish Gray

×1

Catalogue image of the part Plate Special 1 x 2 with Pin Hole Underneath

Plate Special 1 x 2 with Pin Hole Underneath 18677· Black

×2

Catalogue image of the part Technic Turntable Large Type 3 Top, 60 Tooth

Technic Turntable Large Type 3 Top, 60 Tooth 18938· Black

×1

Catalogue image of the part Technic Turntable Large Type 3 Base

Technic Turntable Large Type 3 Base 18939· Light Bluish Gray

×1

Catalogue image of the part Technic Pin Connector Hub with 1 Axle

Technic Pin Connector Hub with 1 Axle 22961· Dark Bluish Gray

×7

Same theme, piece count within 15 %

Similar sets

Heavy-Duty Excavator

In numbers

Product details

BrickLink market data

Can I build this?

Pricing

Price history

Latest price from each shop

On eBay

Recommended retail price

Light kits for this set

Building instructions

Parts in this set

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