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I just noticed that the Z Nut lock is a little crooked. I loosened it to give a little wiggle room and reinstalled the Z assembly. It may have helped but only after I raised the voltage to 1.00v it moves up and down a little , but there are still lots of points where it still binds. I have run the all thread through the coupler nut a few times with my cordless drill, but no change.
Without the tool, and the “All Thread” connected the Z assembly rolls like ice skates on ice. It has a very smooth movement by hand.
I am using a ramps 1.4 from Geeetech (old 3d printer kit) with DRV8825 drivers and Nema17 Stepper Motor 2A 64oz.in. Power supply voltage is set to 12.0v
I still think its my steppers since your using 76 oz/in.
Any more ideas?