http://forums.sketchucation.com/viewtopic.php?p=298614#p298614 will export selected vertices to CSV - there are some variants in the thread...
It should do what you want directly, or perhaps with a little tweaking otherwise 😕

You might have a look at this: http://forums.sketchucation.com/viewtopic.php?t=40061

Wow! Thanks for the help and the education regarding what it takes to make it rotate a precise number of degrees. It was way past my skill level!

Thank you again.

Sincerely,
Bill

@wsellers89 said:

Is there a good reference or tutorials for learning more about Ruby on SketchUp?

post moved to this topic: "Ruby Docs"

Glad the Scaling up, processing and Scaling down fixed the problem - rememeber it for any operations like 'FollowMe' etc...
Some faces must be triangulated to form them - a three sided shape will also face but four points need not all be 'coplanar' and therefore might not 'face'. Some applications like triangulated faces for SUp exports anyway...
Many of the EEby.. tools triangulate the faces initially to ensure that they will 'face'. Then there is an option to erase coplanar edges later - this then removes any edges that are not needed to form a face so four or more sides are possible...
So when it asks you 'Erase Coplanar Edges' say 'Yes' and the triangulation will be removed wherever it can be... 🤓

First SU > DXF, then DXF2IGS. I found this, but don't use this. I understand that there is no fee for a working demo, but you must register. You can try it at your own risk.

I have my Model Info > Units set to return a whole of mm, so if the dimension is not a whole number SUp rounds it to the nearest whole number, but it adds a ~ to warn you that the figure is 'approximate'***...
1.0mm ==> 1
1.2mm ==> ~1
1.9mm ==> ~2
1234.0mm ==> 1234
1234.5mm ==> ~1235
***I find that I don't need to report dimensions etc to anything smaller than a 'mm'... You can if you like... 🤓

Here you can find one.