One of the best packages for converting 2D images to a 3D form is Amorphium.
This package has a list price of $49. It does not make STL files directly,
but it makes a DXF file which can be easily converted to STL.
Regards,
Al Hastbacka
PS
Amorphium has the fastest rendering that I have seen in any software under
$1000.
For more information about the rp-ml, see http://ltk.hut.fi/rp-ml/
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