The stock lead screw nut is cut down on two sides to give it clearance beside the motor on the mount when using the stock extruder setup.
Most nuts found online are circular with 4 bolt holes. We need to cut down one of the sides to allow it to fit.
Gently clamp the nut in a vise and use a hacksaw to carefully trim off one of the sides of the nut with a bolt hole.
Be careful not to clamp the nut too tightly or you may deform it which will make it unusable.
This may not be an issue if you've already swapped to a direct drive extruder that removes the motor from the X axis/Z axis mount.
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