The only factor that I can think of, which shouldn't be a factor at all, is that each cylinder is constructed out of two circles. The Z nominal of the bottom circle is at the bottom of the part with a vector of 0,0,-1, as I intended to get a full length cylinder. As it turned out, I was unable to reach the bottom of the part and instead took it from the top at a much shallower depth with a vector of 0,0,1. I don't see how this would affect anything but it's the only thing I can think of.
