After getting correct DRV8825 driver to control the extruder,see following post for detail of my build https://www.v1engineering.com/forum/topic/what-is-this-symptomatic-of-extruder-z-stepper-issue-or-something-else, it will not turn to extrude or retract. I have confirmed that the driver has .6V. When removing the fan, it appears that the gear stutters back and forth rather than turn as expected. I am at a loss as to what may be causing this.
This video, https://youtu.be/tTyAu8GTBFk, is of a manual 10mm extrude attempt followed by a 10mm retraction via Repetier host. As you can see (i hope, quality may be loww), the gear shakes back and forth, it does spin smoothly in a single direction.
I would appreciate any insight as to what I should investigate, I’m at a loss here.