I am having problems adding fillets to rendered machine parts. I have tried many thing, but nothing seems to work. The programme will not let me add fillets to a 3D object (illegal object warning appears). I have also tried cuting fillets off a simple 2D rectangle, extruding them, and adding them, using add solid command, to the 3D object (cannot preform 3D operation on objects which contain zero volume warning appears). In frustration I tried starting again from simple 2D shapes. The object, from front view, looks like a rectangle with a circle on top of it intersecting the rectagle. I drew he circle and the rectangle, combined them into one object and tried to fillet where the circle meets the rectangle so the whole object would look like a rectangle with a bump on top of it (objects are not consecutive warning appears). Can anyone tell me how to add a fillet to a 3D object????