Dim3nsioneer 558
I don't use the grease UM is providing with the UM2. I prefer a slightly thinner fluid (actually a high-quality oil for bicycle chains) and it runs very smoothly. Maybe you have to oil or grease it, clean it and oil/grease it again?
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aviphysics 9
I have been in a similar situation. Eventually it will work itself out.
I might not do anything until UM decides what they think needs to be done. Anything drastic might complicate the trouble shooting process.
If I were going to try something, it might be soaking the nut in some PB Blaster and wiping down the rod as well. Then clean em off and put more grease on. The nut should turn very easily. Mine turns so easily that the bed will sometimes slide down on its own when the motor powers off.
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