Custom 3D Printed Pen Design

I have a new pen concept that I want brought to life for desktop 3-D printing in plastic. The body needs to assemble with simple clip-on / clip-off connections and house a spring-loaded 1.33-inch ball that ejects smoothly and locks back in place... (Budget: $30 - $250 USD, Jobs: 3D CAD, 3D Design, 3D Modelling, 3D Printing, 3D Rendering, CAD / SolidWorks, CAD/CAM, Solidworks)