Most frequent question I get: Can it be made in a smaller scale?
(Recent example: An item I have is in 1/16 scale and I got asked "can it be made in HO [1/87] scale?")
Please understand that trying to make an item in a large scale into a much smaller scale is almost always impossible. For example, if the real item is 1/2" inch thisk that means it would be 1/32 inch (.031) thick in 1/16 scale. In 1/87 scale it would be .006 inches thick. This can not be printed on Shapeways' printers. Basic rule of thumb, take the real thickness of a feature on the real item and multiply it by your scale. If it is less than .026 inch it will not print.
Beware of "detailed" items being sold on Shapeways as correctly proportioned!
Features such as rounds (shafts), brackets sheet thickness, etc. can not be printed if the final reduced size is under .026 inch. This applies mostly to very small scale items, and often the seller will have to greatly exagerate the thickness so the part will print. Often this is not acceptable to the buyer wanting an authentic look. Just a caution!