Open Wiring chain and belt guards

All credit to Lawsy for the original version of the wiring chain http://www.thingiverse.com/thing:104817

I had to wire in a new piece and it struck me that an open design of chain might be possible: wires could be added/subtracted easily without having to thread them through. While I was at it I figured that I might be able to reduce the thickness and win back some of the print space in the X-axis. I broke the round axis pin for the rear of the machine into two pieces so that could be added without having to pull all the wires out. Finally, I changed the nema holder to have the chain pivot higher up to help the chain go into the belt guards and not crash from hanging too low (with many wires this can be a problem).

I redesigned the belt guards to give me maximum capture of the chain with the minimum of blockage. I made them 40mm long so I could slide a set of 3 around to give me optimal guidance.

So far working very well and I'm about 5mm shy of the full 150mm print area. In addition I can run wires very quickly.

Sorry about the blurring pictures - I was in the middle of printing something.