Rhino offers their product free for the download on their web site.  It is
not limited in any way...until you've saved or printed the 25th file...then
you have to buy it or abandon it.  I understand it is the full version.

Harley

Yes, there is even a good book that includes a CD with the trial version. Any good project may take  at least 25 loads and saves. AutoCAD can do almost the same thing but it takes a great deal more work and cannot easily drive a fillet around the intersection of two irregular solds. SurfCAM also does a great job of this kind of thing but is way more expensive and very awkward to design in.
...Chrissi

 
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