Yet another cable chain

This cable chain was designed from an idea (it was not based on any previous work) in DesignSpark to suit my steel Prusa i3 - it has a tighter radius than some which I thought a good thing. It has some end clips and I will add more as I develop them for my needs - I still have to do the X and Z axes.

Other parts designed for my printers include:
- http://www.thingiverse.com/thing:1959901 (GT2 belt clamp (Prusa Y-axis)
- http://www.thingiverse.com/thing:1937232 (Arduino Mega and RAMPS v1.4 case)
- http://www.thingiverse.com/thing:1905409 (Prusa i3 steel 10mm upgrade)
- http://www.thingiverse.com/thing:1959974 (Prusa i3 Steel Y-axis motor mount)
- http://www.thingiverse.com/thing:1991116 (Prusa i3 Steel X-carriage)
- http://www.thingiverse.com/thing:1991117 (E3D Chimera / Cyclops mount)
- http://www.thingiverse.com/thing:1994413 (dual E3D Thermocouple amplifier board - housing)
- http://www.thingiverse.com/thing:1090661 (Belt driven Bowden extruder with 1:2.5 reduction)
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