I need to print some parts that are in the .06 - .08mm thickness. They are shaped like a bell or half circle, so they have an opening. I need the material to be rigid, with not much flex at that thickness. Is there anything out there like that, that would be fairly economical as well?

I played around with a friends printer (dental), and the parts came out beautiful, but too flexible.

P.S. I'm a real newbie at this stuff!