I've had a CNC mill for years but have been too busy to do anything with it (partly because of the steepness of the drafting learning curve); nowI have a need to do some engraving so need to gather my courage. The Mill is a Denford Starmill. I've got a copy of Mach3 but very little knowledge and no experience. What software do people recommend for engraving? Free is always good, but I'd be prepared to spend some money if that means the learning curve is more shallow.