Bill
The analysis box is from Freecad (Mesh Workbench).
Whenever I see problems in the toolpath when using an stl, the first thing I do is
export it to Freecad and check it for errors, Freecads analyser is very good and the
repair tools work well enough.
I do have other mesh programs, and for the most part they are ok, but I use Freecad for
the 3D modelling, so it's at hand as a drop down menu.
As to the model itself, one of the faces cannot be cut as it has an overhang.
This is the dodgy end, If I were drawing this part in Freecad , I would make a loft between two
sketches and use a Boolean cut for the end notches, if the Booleans are not perpendicular to the
base plane (maybe their attachment angle is a little off), this can happen if you manually place them rather than use an attachment mode.
With your file, I did a detect edges to get a wire frame and selected the top-down view.
You can see the geometry creating an overhang meaning that that face cannot be cut this is what is probably giving CB headaches.
It might pay to increase your resolution for export in rhino as it's a little low and the
tessellations will show up in the cut face, this looks like tool chatter.
Nearly always it's the imported dxf, stl or step files that will give you grief.
Dave
