Important: I just realized that if you have a thin glass build surface and happen to have a V4 hotend on a machine without the heater wire support on the build plate, that using this bracket may give you clearance issues and bump against the nuts on the underside of the X axis rail when you set the zstop appropriately. If you are using a thicker build surface like a Mic6 or zebra plate or an E3DV6 this shouldn't be an issue.
I modeled this bracket to provide strain relief for Makergear M2 heated bed wires which, on older models, flex continuously while printing causing the wires to break. It attaches to the spider with 20mm M3 screws threading into the existing tapped holes under the rubber mounts or these mounts: http://www.thingiverse.com/thing:602194
The hole for the wires was designed to cinch down on 1/2" corrugated wire sleeving (not pictured), but just a zip tie on the deans connector seems to work fine. The strain clamp support attaches to the bracket with M3 screws and nylocks