X-axis. A simpler approach was to use a scissors-type of assembly that just kept the cables neat, yet out-of-the-way. I ran both the stepper cables and the router power through this arrangement.
At each joint of the scissor is a 3/8" OD nylon bushing, cut just slightly longer than the material thickness to avoid binding the joint when the nut is tightened on the screw. Click on the image to see a larger version. All 3 joints are made in a similar fashion, with the length of the nylon bushing and the 8-32 machine screw adjusted to fit the materials and washer thicknesses.
After the first test, I realized there was no good way to support the cables, so I made the 8-32 machine screws a bit longer and added a wire loom clamp between the nut and the last washer. I sized the clamp large enough to allow the cable to move freely.
It seems to work great.