Machine it on a very accurate 3-axis mill if metal, or cast it in a mold if plastic.
You will probably want to add some tabs to hold the part, and cut them off later.
Create a rectangular surface and set a thickness of 0.1mm, then subtract. The surface must be another solid body. You can parameterize the surface construction lines so that you have rectangular, squared, carved pentagonal profiles.
Luigi, I am talking about manufacturing it , makig real sample of the part ?