The stepper motor wires that run from the X-axis bracket to the Y-axis bracket need to be kept from drooping down onto the workspace or into the gantry as the tool moves across the beam. These two parts keep the wires neatly out of the way and allow easy tension control. A couple of the images are rotated 90 degrees and the top image was cropped in the main view so the Y bracket is cut off, but you can see the full image if you click on it to open the viewer. Don't know why the images are rotated, as they are upright in my gallery, but I am unable to get them to upload in the correct orientation. Hope that is not too confusing. You can see the images displaying correctly on the shapeoko forum: http://www.shapeoko.com/forum/viewtopic.php?f=11&t=3899 Print the two parts. Mount on the X and Y brackets, as shown in the photos. I used M5 12mm bolts for mounting, placing them through the available holes (in the Y bracket) and slot (in the X bracket). Next route the wires, as shown. By leaving some slack in the wires as they run down the part on the Y-axis, you have some ability to change the tension in the wires easily. If the holes are too small to allow the wires through easily, just drill them out to be bigger, so that there is no pressure on the wires. Use tie-wraps to neaten things up.