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Re:Printrbot: Your Very Own 3D Printer by angusgr on Monday November 21, 2011 @12:13AM (#3260084)
You haven't said where you are based, but for starters look for either PLA or ABS on this list: http://reprap.org/wiki/Printing_Material_Suppliers (The Reprap wiki also has pages explaining the pros & cons of each.)

I don't know what filament diameter(s) the Printrbot will support.

Re:Printrbot: Your Very Own 3D Printer by simcop2387 on Monday November 21, 2011 @10:10AM (#3261325)
I apologize for not saying where I'm based, (US by the way). But that link is absolutely perfect.

According to the comments on the kickstarter page it'll support 3mm to start with and they plan on having a 1.75mm hotend available for $59+shipping by the time that all the kits are shipping.

EDIT: corrected price of hotend