What type of x axis carriage do you have? It could be that as you get close to one side of your printer the x axis smooth rods go out of parallel and become harder for the motor to move the print head causing skipped steps.
Have you tried printing the object at different spots on the bed? Maybe you will see that as you move it far enough one way the motor doesn't skip any more.
Tell us more about the x axis framework too.
Have you tried printing the object at different spots on the bed? Maybe you will see that as you move it far enough one way the motor doesn't skip any more.
Tell us more about the x axis framework too.