Very cool Wachara! Which model did you get? If you don't mind, can you post close up shots of the final plastic pieces so we can see the resolution capabilities of the printer? I figure I'll wait a good 2 years until I get one since that area should be much improved in that time.
Really I just want one for things that would require more than a 3 axis CNC, like the hinge mounting holes you have on the sides of the cups. Don't forget to draw a slit for the cable to fit through. :) I think it'll also come in very handy for making a piece that connects the hinge to the headband. Good luck!