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Works perfectly with stock parts, I've also used smaller motor (you can use any from the x,y,z axis) so there is no need for x spacer

you can also just order another smaller motor, even super thin like https://aliexpress.com/item/32841621498.html?spm=a2g0s.9042311.0.0.7b364c4dI7Duzw (but that one has less torque so for stock setup you would need to run it crazy high vrefs - tested)

if you want to use existing non-extruder motor (if you don't have spare one or don't want to order one) the simplest is the replace it with the x-axis motor
if you take it from the y you will need to offset the axis endstop as otherwise motor will hit the bed - https://www.thingiverse.com/thing:3398302
if you take it from the z, then you will need to use t-nuts, or drill new holes to mount taller extruder motor or use a holder like https://www.thingiverse.com/thing:3370669

Ender 3 Y Endstop
42-40 Stepper motor holder for ender 3 Z axis
by Luo52