Hello,
This is not directly sketchup related. But would be very handy. I used to have very good FREE software for converting all kinds of CAD files to another CAD format (dwg, dxf, stl, obj, step, 3ds, … many more). It could also convert entire folders of files at once and would show the progress. I can’t find it anymore. Google only shows me converters with trial versions or converters that don’t always seem to succeed., or can’t do entire batches/folders of files…
Please let me know what is your favourite Cad converter software? Maybe I’ll find it again 
Thank you very much