Well for one, the only certified food safe printing material is ceramic (which is currently unavailable, should be back soon), which internal geometry won't be glazed so wouldn't be food safe either. But when it does return, it was priced by surface area. The least expensive material is sandstone right now, as long as your walls are 3mm thick. If you want to use other materials, check out their restrictions, as you can get thinner walls with most other materials https://www.shapeways.com/materials/
The prices are mostly based on volume, which increases exponentially as the object gets bigger. A cube that doubles in size will cost 8 times more. If your cup were half the size, it would cost about $60. You will have to either thin the walls or maybe try a Pythagorean shot glass.
LOL, thanks for the info but I have one more last question...do the more polygons make the cost bigger? *ok my english are terrible
I have just made a new model and it has 600.000 polygons but when i upload it the message says "too many polygons". What can I do?
New and improved sandstone is 2mm walls see https://www.shapeways.com/materials/fullcolor Very cool model though
Thank you very much but why i get the message "too many polygons" when my model has 600.000 polygons (less than 1.000.000) :confused
A four sided polygon is made up of 2 triangles, 5 sided = 3 triangles, etc... the limit is 1,000,000 triangles
He's saying that your software may be counting polygons as any 2D shape (triangles, squares, trapezoids so on) Shapeways allows 1 million triangles, each square would be 2 triangles. A model of 600K squares would be 1.2 million triangels.
^^^ what Mike said Its a bit confusing getting an email about polygons - generic name for 2D shapes, no matter how many sides when Shapeways actually mean triangles - specific name for a 3 sided 2D shape