As many of you know, vector PDF print output from Rhino V5 is not currently possible.
It is on the feature Wish List.
In the mean time, with the help of Rhino user Kevin Knox, there is a printing and conversion process you can use to get vector output and get it into a vector PDF format. It requires Windows 7 or 8/8.1
1 - Print from Rhino and use the 'Microsoft XPS Document Writer’ printer option.
2 - Choose the XPS file format.
3 - Use a conversion tool like PDFaid [https://pdfaid.com/vectorpdf.aspx] to make a Vector PDF.
There are quite a number of XPS to PDF conversion tools. Some are free, many don’t convert to Vector format, so do a little hunting around until you find one that meets with your sensibilities.
The PDFaid tool I used even supported the line widths and line types I specified in Rhino. The free version watermarks the PDF.
XPS print test.pdf (22.3 KB)