Hi Michael,

If you do pursue a 2d dxf export, having a user definable tolerance would be very useful to convert splines to arcs.
Ideally you would be able to do conversion within Moi so see the results, but just having a tolerance on the export would be OK as you could check it in another application.

The reason a lot of CNC apps still want DXF format is specifically for arcs. Splines are not typically supported in CNC applications, and when they are, there still can be some question about how they get converted to arcs. Because there is no standardized method for converting a spline or bezier curve to a series of arcs, the only guarantee you will get a specific output is to start with arcs.

I have seen some really scary results from using splines, and granted, it was on a CADCAM system from the early 90s, but a lot of those systems are still around.

Chris