Turning lego set 42121 into a crawler crane, I'm waiting for more parts, but this is what I have so far! : r/legotechnic
LEGO MOC 42121 Heavy-Duty Excavator Full RC MOD by Seo-onDaddy | Rebrickable - Build with LEGO
42121 LEGO® TECHNIC Hidravlični bager | Conrad.si
Amazon.com: 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