Sk-Go Cable Strain Relief Bracket

Finally got around to making a cable strain relief for the hot end carriage. Fits using the existing screw for the motor, and uses an alignment pin for the interior screw that would be a PITA to get to. There is also another slot for a screw, but it seems plenty strong without it. You can either use it also, or just leave it open to leave that hole still available for future requirements.