Shifting in X or Y axis can be the result of a few issues:
Loose Belt Pulley on the Motor Shaft
Loose pulley usually introduces more layer shifts than just one.
You can easily check this, if you move the axis from the LCD menu, which locks the motors and then try moving it by physically by hand.
Using the allen wrench, check to see if the set screw of the X-axis is 1) secured tightly onto the motor shaft of the X-axis motor and 2) the set screw is secure of the flat side of the X-axis motor shaft.
Improper Belt Tension
Too much slack introduces slop into the positioning of your X-axis. Too high belt tension and your motor has to work harder to move things.
The tension should be low enough that you can move the axis physically by hand without too much resistance but big enough that when the motors are locked (move the axis from the LCD menu) the axis shouldn't move from side to side.
Dirty Linear Bearings
Overtime, dirt/debris may build up on your X axis linear motion components like the linear bearings or the linear smooth rods. While the machine is powered off, move the X-axis carriage by hand. It should glide smoothly, but if it does not, it is a sign that some lubrication is necessary.
When applying lubrication, be sure to wipe off any excess, as leaving excess there will become a magnet for more debris.
Multi purpose machine oil should do the trick.
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