Topic: My two most annoying problems
The y shift is caused by two different things on my machine.
1) If I don't have a cooling fan on the electronics.
2) The friction from the rear bushings on the Y axis rod. (I don't know a better name for this rod)
I've heard some people have found changing the belt tension on one side or the other will solve this problem.
The z axis wobble matches the threads on the z-axis.
I'm not sure if I'm going to be able to solve this one.