I did a linear rail update for my Y axis (see Thing http://www.thingiverse.com/make:70554 ) and the smaller amount of room between the new rails and the cables for the heated bed and the thermistor kept hitting the blocks which hold the LM8UU bearings... well, it finally managed to pull the wire on the thermistor enough that it broke it. So, I needed a cable clip to hold the wires... so, here's that design. This is the 3rd revision, and this is the one I'm setting on and like. It clears the bearing block easily, and holds the wires safely.
Be cautious on placement of the clip, such that it doesn't cause interference with the housing (assuming you still have yours on your printer) It's a close fit, but it will clear if you position it carefully. I affixed mine to the bed with the same ultra copper permatex used for attaching the thermistor to the hotend, so shouldn't be a problem with it releasing from the heated bed at high temps.
I printed mine at 200 micron, at 75% fill, in Black PLA.