I have the model below that I would like to engrave the razorback onto the surface. I have to export the model as an iges or step and import into Fusion 360 for my CAM. When I do this, the curves are no longer there. I have 2 questions regarding this. Can I export the model into a universal format where it retains the curves? Or can I actually model the engraving easily in Rhino? Just for grins, I used a sweep1 with a circular cross section and made a sweep around the outside curve, however when I used Boolean Difference, the top surface of the model disappeared. Otherwise, it worked seemingly fine.