Sign upLog in
Buying opens soon. Browse the catalog and track prices now, or get notified the moment it goes live:
Heavy-Duty Excavator

Snapshot

vs RRP
+75% over
Per piece
7.6¢

Value per piece

cost per part at each reference

7.6¢lowest market value

Reference

MSRP7.0¢
Used market7.6¢
New market12¢

Where to buy new

  • Walmartout of stock$99.99
  • Amazonout of stock$104.99

New at retail · MSRP $39.99 · via BrickPicker

Set Retired

Heavy-Duty Excavator

Reference
42121-1
Theme
Technic
Year
2021
Parts
569

Heavy-Duty Excavator is a LEGO set from the LEGO Technic theme released in 2021. It is built from 569 pieces.

New avg$70.00Used avg$43.50MSRP$39.99

Avg. 3rd-party market prices via BrickPicker, not CollectORbuild seller prices

See full valuation & price history →Track its value free →
Value historytracking since Jul 27, 2026

Currently $70.00 new. We just started tracking this set’s value. The chart fills in as prices are re-checked over the coming weeks.

Compare this set with another →

Parts in this set (131)

View all parts →

A peek at the pile. See the full list, grouped by color, on the parts page.

Sticker Sheet for Set 42121-1Photo shows a different color. This lot is (Not Applicable).1×Brick Sloped 18° 2 x 1 x 2/3 with 4 Slots / GratePhoto shows a different color. This lot is Black.4×Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope)1×Hinge Cylinder 1 x 2 Locking with 2 Click Fingers and Axle Hole, 7 Teeth1×Hinge Plate 1 x 2 Locking with 1 Finger on Side, without Groove1×Plate 2 x 21×Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper)1×Plate Special 1 x 2 with Pin Hole Underneath2×Technic Axle 46×Technic Beam 1 x 2 Thin10×Technic Beam 1 x 3 Thick2×Technic Beam 1 x 5 Thick5×Technic Beam 1 x 5 Thin with Axle Holes on EndsPhoto shows a different color. This lot is Black.2×Technic Beam 1 x 9 Bent (7 - 3) Thick4×View all 131 →