Hi, I see that ceramic objects are priced by surface area rather than volume. Does that include the bottom? For example, if you were to print a flattened cube, would the surface area be the total area of all 6 faces, or just the top and sides? e.g. Rectangular prism, 10cm x 10cm x 1cm Total surface area = 100 (top) + 100 (bottom) + 4x10(sides) = 240 cm2 = $43.20?