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i have se same problem as blkbaron. I've use your parameters for sclicing with Simplify3D, Cura and Repetier Host. With yours parameters (schell= 1 and infill 3%, the infill make a second outline somtime on the schell (that increase the weight). Wath software are you using to print ( on screenshot it seem to be Repetier but you speak of Cura below) and wath patern for infill?
Thanks a lot