Anet A8 z-axis Synchronize with 1 or 2 Motors

This is a modification of the Anet A8 printer frames to synchronize the 2 z-Axis motors. This is an update of the Anet A8 Z Redux - Synchronized motors by uanCarlos_3design http://www.thingiverse.com/thing:2097301

I had ongoing z-axis syncing probelms between the left and right sides. Re-wiring the two z-axis motors in series helped but did not solve the problem. Finally I tried neoxM3's frames but my z-axis screws were too short.

My rework
Since the z-axis screws were too short to exte