Wanhao di3 x-axis belt spacer

This is another way of solving the problem of the x-axis belt rubbing against the bearing housings of the Wanhao di3. The concept relies on two home-made "rollers" used to push the upper part of the x-axis belt that tiny bit required not to rub against the housings, while at the same time reduces wear on the belt which is now in contact with a rolling, not a sliding surface
This approach is less intrusive than the one involving trimming of the upper bearing housings with a hacksaw in order to i