Even with the all surface area of the lead screw threads I have had that side of the coupling move also. It happened during the EMC2 configuration testing when the z axis was going up and down repeatedly. I think the Delrin coupler had relaxed (cold flow) under tightened screws over a period of time and the reversals made it slowly unscrew a little each time it started going upwards. probably had the acceleration setting too high also.
Just for grins, try lowering your acceleration setting for the z axis and see if it has any effect on your problem. I doubt that it will, but it's something else to try.
CarveOne
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CarveOne
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