I have a really intermittent problem. First, a couple times, the Z slipped a little (I think) when drawing with a sharpie and ended up higher or lower than it should and either barely touched the board or pressed hard enough to make the pen slip upwards in the holder. So, thinking it might be related to a lack of lithium grease, I took it off and applied the grease. My method of applying was to lay the removed Z axis on its side and spin the motor by clicking manual +10mm 30+ times in Repetier. It would queue up the clicks and I could hold a paper towel with the grease on the spinning shaft. But, the shaft would occasionally reverse directions and spin the other way for several (5-10) seconds. When spinning the wrong way, there was no noticeable difference in the sound of the motor.
So, when I was drawing, maybe the Z slipping was really it going the wrong way, or maybe it was slipping. I don’t think it was slipping because it sounded like it was struggling or grinding vs just spinning. Plus, last time I watched the pineapple and it looked like it was not moving.
As for wiring, The Z wire has been replaced with Cat5e cable with the ends cut up and the twisted pairs spliced into the Z wiring I got from Vicious1. The slipping during draw occurred before and after I extended the wiring.
After applying the lithium, I have not noticed the slipping, but I have not done much testing. Does anyone have a clue why it would have reversed during repeated +10mm commands?
I have not yet used my setup for cutting as I am still tweaking/neatening/etc (such as adding drag chains and a RAMPS case with fan) and learning the software. Once I am comfortable, it will move off my coffee table to the garage to do messy work.