Hi.
I have tried Cura to print this part on my UM2, but because it printed pretty badly, I used Simplify3D instead. Although quality is better than using Cura, I get a weird layer dent on the middle of the part (it is not a crack), as you may see on the following picture. I have repeated the print two times with identical outcome. Other ugly effect you can see is that the first layers are printed inwards(perhaps too hot bed?). Material is PLA at 0.2mm, using default Simplify3D parameters for UM2.