I had my x-belt snap on me recently after ~1 year of use. Bummer! My x-axis never did traverse easily. When i say easily, I mean to imply that it took a gentle, but forceful finger to get it into motion in a ‘steppers off’ state. So, on every spot where the belt rides on the support washers, i layered some PolyLube 1000 bike grease. It now rides much easier and smoother! Booya. I could feasibly move the belts up a little bit where they pinch down, but I believe that has only a marginal effect. Keeping it parallel and clean will keep the belt-carriage join as stress and strain free as possible.