So, we managed to create a triangle with the specifications given in Freecad, using the method we described earlier. We are in the process of printing it out. We will post the results on the page linked before. So if anybody wants the STL file for a triangle please follow the link.

We have also described the process that we used to create the Triangle so it also serves as a little tutorial on "Sweeping" or extruding along a path in Freecad.