The file 'Ender 3 Y-axis Stepper Motor Damper And Heat Sink Spacer For Removable Pulley 3D Printer Model' is (stl) file type, size is 77.7KB.
The Stepper motor with a dumper and heat sink doesn't have enough space and block before it hits the endstop. This makes room to fit it. You will need to install the pulley backward
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