Makerfarm i3v Z Motor mount & Coupler Upgrade

**9/2/2018 Update**
I have since updated to using the M8 leadscrew & remixed cperiod's design of the lead screw nut plates that allow you to use the same Z motor mounts without any changes. You can find his design here: https://www.thingiverse.com/thing:2917730 and I also made a remix of it. It has been work quite well.

I made this for the Makerfarm i3v 10", but it is my understanding this part is the same for the 8" & 12" version also. This is for the i3v that uses M5 threaded rod. I work