I spent a little more time with this. First problem I had was importing it in at a reasonable size. F360 doesn’t know if it’s in inches, mm, etc and this info isn’t encoded apparently into the file. F360 also defaults to cm for things like this. So I imported the mesh and went into the Mesh menu to reduce the density so F360 would quit bitching about the size (.20 seemed to work). Then I converted to BREP. I immediately went to CAM, flipped to the backside, realigned the Z axis, selected 3D adaptive clearing, selected a 1/8 inch flat end mill and clicked okay and then went to the sim. Note: I took Lars’ advice for 3D and made no adjustments to the adaptive clearing. I just picked the tool and clicked okay and let it figure everything out. According to the simulation, that gives me a flat backside. I then went back to the front size and did the same thing with 3d adaptive. See what happens without selecting any contours or changing anything. Once you get the feel of it, you can start trying other finishings and adjusting the settings. Lars’ point was to see how the defaults work first. By the way, This is just from using the defaults and letting it choose the contours.A lot more time would be needed to see if it could be made acceptable/good.