Thin Filtertron Pickup Ring Model

I need a straightforward 3-D file for a pair of Filtertron-style pickup rings that will sit on a Red Special-inspired guitar. The rings themselves should be very slim—about 1.5 mm thick—and intentionally clean, so leave out all screw holes and countersinks... (Budget: $10 - $30 AUD, Jobs: 3D CAD, 3D Design, 3D File Scaling, Slicing & Print Preparation, 3D Modelling, 3D Print Design, 3D Printing, 3D Rendering, CAD/CAM)