bmmal - I should add that your prototype can certainly be printed and then coated with a food safe coating.

printedsolid - That's true for the consumer grade machines, but the pro machines are used for printing medical implants, so you can certainly find food safe options. Although getting something printed on a consumer grade machine and either coating or molding in a food safe material is probably a more economical approach.

bmmal - The problem often is not the materials themselves but the fact that there are tons of microscopic voids that trap bacteria in them regardless of which FDM machine it was printed on. SLA of polyjet probably would not have this issue.

gogo3d - thank you for your responses! do you know any polyjets on makexyz?

bmmal - The company I work for has an Objet Eden 350V. It's not listed on makexyz but I can help you arrange something.

I apologize for not being clearer earlier, but I am not aware of any polyjet materials that are food safe themselves, although they very well may exist. There is a dental material available but you have to have a machine that is dedicated to printing only that. Polyjet will essentially eliminate the problem of voids though and they can achieve much higher finish qualities. That said, polyjet is generally much more expensive than an FDM print especially because it will more than likely be done by a commercial business.

As PrintedSolid mentioned there are FDM materials that are biocompatible such as Stratasys M30i. This material can be sterilized via gamma rays but without such treatment inbetween every use I would not think it to be food safe. http://www.stratasys.com/~/media/Main/Secure/Material%20Specs%20MS/Fortus-Material-Specs/Fortus-MS-M30i-01-13-web.pdf

This thread on RepRap forum is full of good information in regard to plastics, 3D printing, and food safety: http://forums.reprap.org/read.php?1,164077,168351

If you're still interested in having a prototype printed whether by FDM (I have a Stratasys Dimension but it can't print M30i) or polyjet let me know and I would be happy to provide you quotes for either or.

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