Hi Tom, first of all let me thank you for providing a fantastic design for the damper. I just finished printing my RSD-BGE with Ultimaker 2, and it looks awesome.
I tried to import your .dwg file to SolidWorks, but that didn't work too well. I also tried to edit the design with Inventor, but my Autodesk skills are nonexistent, and I wasn't able to change the dimensions of existing holes. It's probably just my laking skills, but I was wondering if it would be possible for you to make an export from your CAD to a format that might be better suited for SolidWorks.
My goal is to edit the damper to be a better fit for Europeans; e.g. 1x2" opening to 25x50mm, size the RJ11 hole to fit something more easily available from EU stores than the HomeDepot jack and so on.
Thanks Antti. I'll put up solidworks compatible files in a few hours.