Hmm. Guess it is time to rebuild. Went to print today (and my printer has been working fine for over a year) and the extruder motor would kind of bob back and forth rather than spinning. Can't jog it reliably in either direction.
Swapped out it's connection for the one for my x axis to trouble shoot. If x axis motor has extruder connection, it moves back and forth fine. If extruder motor is plugged into x axis, it still does the bobbing back and forth. So, either a bad 4 wire connection to the motor or, more likely I think, the motor got damaged.
Anyone got any good links for plug and play nema 17 motors of the same specs from ebay or amazon or ?? I need to get another one anyway as I have +Peter Stoneham
's v2 dual mk8 extruder build to do so I was going to have to rip off all of this crap for the extruder anyway.
Also, what is the best easy replacement control board people are using these days? I might rip that out if I'm stripping this whole thing down anyway.