Trinus extruder cables strain relief bar

A L shaped bracket that bolts between the two Z axis towers (print has two M3 nut cages).
It can use the spare bolt holes just below the control board. At this height there is only a very short length of cable to the control board, leaving as much cable length as possible to flex with movement from the extruder.
Provision for two cable ties per clamping position (so the cable doesn't twist under strain from the X axis, as it does if you only use one tie). (wires can be tied together or tied as