Hi lee - that's because your base curve that you are extruding is made up of many segments.

Each segment in the original curve will extrude up into a different surface that is joined with the neighbor surfaces.

If you want to reduce the number of edges, you'll need to fuse together those many-segments into single larger segments. One way of doing that is to turn on control points and delete the control point between 2 segments - that fuses them into one segment.

The one that I drew did not have so many pieces because I drew the outline as one longer curve using the Freeform curve command. That made mine just one segment (or well 2 after mirroring).


re: can't fillet more than this - the maximum amount of fillet can be limited by tight curves in your shapes, but I don't see anything really too tight in your screenshot there.

If you can upload your .3dm model file before filleting, I can take a look at it to try and see why you can't fillet any larger than that.

- Michael