It's great to hear what we do can help many people. What application do you use now? In my opinion, almost all 3d modeling applications, can read the OBJ format. Suppose by installing Autodesk Netfabb. Please use the imported STL format command, then do the OBJ export format command. This step is an alternative while waiting for us to send the file in STEP / IGES format.
Best regards from Indonesia