Once upon a time I was filing for a patent and in the spirit of things I dusted off the old drafting square and compass to provide the necessary technical drawings that were based on my drawings and the step files that matched them.
Despite my artfulness and the artworks ability to get the job done they were quickly rejected for not being digital or whatever? I was dumbstruck, but soon enough a company provided by the patent attorney stepped in and made the necessary changes. Finding out who they used would probably cost me $450 an hour to call them and ask. .. sooo.. I'm asking you. 
I was looking into it and it seems there are more than a few companies or persons providing this type of service.
I was wondering if any of you do this work or had recommendations or experience with any services or individuals you've worked with. Is there an app for this!? (a file would be available for this simple project)