Model Builder Community

I've just finished my first two buildings in Model Builder and Im impressed with the result. However I can convert them to pdfs. I've tried Primopdf as suggested but it doesnt recognise mb4 files. Any suggestions?

Primo installs to your Printer folder and shows up as a printer.
So when you have Model Builder open with a project select File>Print. Choose your pdf printer. Wait a bit. When primo opens choose "best" or "pre-press" settings. Viola!