A fairly accurate model of R2-D2 holo projector with a separate lens and the eye socket.
This is a full model for building into a dome, but if you need one just for surface mounting (dummy projector), you can use the included surface-mount models. The surface-mounting version does not have a hole all way through, so you might want to make one in the model before printing it.
You can use the "lens polishing rod" to hold the lens in a drill chuck, so you could polish it easily using some sand paper (take the rod out when you're done). You can also use acetone polishing, if printing in ABS.