I've made this object to fit inside a tube, which I used to cut the object to fit. This resulted in an edge (area in red) that's being rejected by Shapeways as too sharp to 3D print. I selected the entire edge of the affected face and tried to apply a fillet and a chamfer, at distances of .05", .1", and .2", but MoI never stops calculating (on a six core Xeon running Windows 10 x64). Suggestions?