The way I would generate 1/2" fitting sections would be like so:
here is the example file: SectionPrinciple.3dm(202.8 KB)
Next you need to get those sections out of Rhino for printing.
Best would be to rotate them to lay them flat on the XY plane and space them.
Check what file format the printing service wants/accepts and their max paper size.
Next you can export or print to pdf the separate sections.
note: ALWAYS check if the printouts are the correct size/scale (in both vertical and horizontal direction)
for these type of jobs I place reference lines of known length on the prints that I can measure to check the correct size.