I have a 2D drawing (LibreCad) that I want to have a prototype made from, using "3D" online printing. The company say that they need a "CAD" .stl file. How do I do this. I should add that I have absolutely no experience of "Cad" programing. I have just downloaded "FreeCad".I do hope that I have used the right means for this question. Thank for your time with this.
I think if you have a 2D drawing or CAD file you will need to make a 3D model (or ask a GrabCADr) and then depending on the 3D modeling software do the "save as" option Hans was talking about to save it as an STL. The STL file format is 3D so you need 3D data for that which is not contained in a 2D drawing file.
Upload your file to your profile and ask some one to help you 3D model it and I am sure you will get a model fast (if your part you are wanting is not too complex and your drawings/2D files are good) for free!