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I had only looked into 3D printers a little but I thought they were quite affordable now and the plastic material that they use is pretty cheap too. What turned me off and what I think is the most important part of 3D printing for duplicating parts and such is a 3D Scanner which is much more expensive. Without a scanned all you can print would be something developed in a CAD Software program. To me, unless you have access to somebody else's scanner I wouldn't have a used for the printer. My use would be to scan a part and in a CAD program make some changes before printing like smoke box doors scaled down to fit perfectly on a defaced train or specially created couplers.