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Amazon.com: LEGO TECHNIC 100 pcs BLACK AXLE SIZE 4 STUDS STUD LENGTH Cross Rod Short Mindstorms robot motor part piece 3705 NXT ev3 robotics : Toys & Games
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LEGO PART 59443 Technic Axle Connector Smooth [with x Hole + Orientation] | Rebrickable - Build with LEGO
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