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This is a set of 20 Doric Columns 20mm high actual printed dimension. Just over 9' 8" (2960 mm) at UK N Scale 1:148.
A cheaper option is to buy the columns connected by a 1mm sprue. Shapeways have a per part charge. Columns can be cut from the sprue and the connection point sanded to smooth the finish. If you are interested in the cheaper option click here