it's a simple shape - ANY cad program will let you do that - and easier and quicker than the post processing involved in low end 3d scanning scanning.
I'd use openscad - but anything from tinkercad on up would work fine.

To actually answer your question - yes.
Autocad can generate stl files for use with 3d printers.
But you need the full package not autocad lite (jut 2d).
And probably an add in to make the file 'solid' and generate the stl file.