Y axis / bed cable chain anchors for Lulzbot TAZ

Anchors to attach my [printable cable chain](http://www.thingiverse.com/thing:1383667) to the bed and vertical strut on my Lulzbot TAZ. It requires one M5 bolt and T-slot Nut (drop in nuts work well here) and a zip tie.

There are two versions of the anchor for the strut because I think the only sensible way to print this shape is in two pieces, but I have provided the complete (hard-to-print) part to show how the 'nub' should be glued to the main part (PostAnchor_Nubless).

This is partial