I stopped printing the part after a little more than 8 hours. Here's the result:

IMG_20150713_094723.jpg

I stopped the print for several reasons:

1. It was clear the slanted ribs were too weak to provide proper strength and support

2. I had a parameter error in Kisslicer that resulted in many strings and hairs; I removed most of them by hand for this photo

3. Even though I had a layer height of 0.200 mm the whole part looked rather rough

I broke off a couple of the ribs while using an Xacto knife to remove some of the hairs - even though I was being quite careful. I guess the moral to this story is: just because you can design something does not mean you can print it.

I've had excellent success printing more "solid" parts so it looks like I'll have to change my design ideas a bit to accommodate the limitations of printing in the real world.