RobotDigg end effector for Kossel strain relief

This is a remix of http://www.thingiverse.com/thing:737707.
Seeing the wires around the end effector constantly move during a print made me realize a strain relief was needed. I liked thing 737707, and could easily modified it to fit my RobotDigg 'End effector for Kossel' because the OpenSCAD file was included; kudos for that! Besides to make it fit the end effector, I also changed the part that holds the screws of the clamp, that now uses nuts.