I am using a UM2 with simplify3d. When printing a cylinder the OD of the part is close to the CAD dimensions whereas the hole diameter is always smaller by .4-.5mm. I am not sure what setting i am missing in simplify3d which kinda sacrifices the internal holes or empty space. I am sure the UM2 is calibrated as i do not see the same problem with cura or slic3r. I almost feel that simplify3d adds an extra line of material and in that process makes the part out of spec.
Looking forward to a solution/feedback.