Head cable middle guide

I designed this guide to hold a wire out the action zone of the sliding rails in order to constrain the head cable of **EZT T1 Delta 3D printer** so as to allow it to move around the center point and prevent the cable from getting stuck under the sliding rails.

Two of the object need to be printed in order to allow to pull a wire between two supports. Another wire constrain head cable to the middle of last one.

I had only M4x12 rods so I adapted my [previous work](https://www.thingiverse.c