Print Question

I have a question about this print. For some reason i see the middle supports leaving "dents" in the outside. this is a test part for a plane from 3dlabprint. I tried to convert the settings they showed for Simplify3D and cura to my repetier slicer and it seems that I may have missed something (s).
I am using an HE3D EI3 printer that has 3 extruders on it, i am wondering if the dents in the outside are caused from a different extruder hitting the part.. I know the tolerances are close, but i think i have all 3 nozzles set the same (still working out the best way to make sure they are all the same).
Here are a few pics on the part in question
Side and bottom view 
Side and top after stopping

Any thoughts here would be most appreciated.
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