It sticks to the table fine, and the plastic bonds fine, as well. The problem is that the build plate vibrates. When it does that, the movement is compounded by the height of the object being printed. As it gets to about 1 1/2 to 2 inches above the build plate, it's vibrating enough that as the plastic melts and tries to adhere to the plastic below, the plastic below it is moving, preventing adhesion. It's like trying to glue two pieces of wood together that are constantly moving. It's not gonna work.

I've been printing a few prototype brackets and they're all coming out fine because they're flat pieces of plastic. The risers are only 1/2" tall, so they print fine too. Anything taller than that, then it gets more and more brittle as it gets taller, to the point where the print head is just moving around dropping a string of plastic as the whole build plate wobbles around.