my patent attorney told me to send him a dwg file of my 3d printed invention that I am working on getting patented.  It's a very simple geometry that I have in Tinker CAD, but I have not used CAD software outside of Tinker CAD in 20 years and can't figure out how to export it to a DWG fie.  I have the stl file that my printer reads and i have an stp file, but I could use some help on converting it to dwg for his needs for the patent Some stuff I have read say that Fusion 360 can do the conversion, but I am very unfamiliar with that program. Thank you very much for anyone who can help me.  

Fusion is really the easiest method to make DWG from a Tinkercad design. You can also go through STL but your model will be tessalated.

Can I do it on the free version?  I tried to and either you can't do it or I could not figure it out.