How to insert 3D model into PDF file? There are two methods. Simple 1 and Simple 2.
#1 If you have 3D model in u3d file format, just drop it into priPrinter window, align position in the way you want to and select Save As PDF file in File menu.
#2 In FinalMesh application, open your 3D file, click on File button, select SaveAs. Select PDF. Now you are free to pick any template you may like, adjust initial view, render mode and lighting. Click on Export. Learn more about FinalMesh application.
Actually there is one more way. In FinalMesh save your model as .u3d file and insert it into priPrinter or any other PDF authoring application.