Hi All Having much experience in obtaining brass castings of a specific size using 'traditional' method of resin master-to-rubber mould-to-wax-to-casting, I am guessing that we would need to allow for some shrinkage of the Shapeways raw brass material if we are aiming for a particular size? Could tech support please correct me if I am wrong, or enlighten me as to what the shrinkage percentage is if I am right? I am not looking for micro-precision here, just a rough guide - it is usually easier to scale the model up slightly and have to file a bit of metal off later than to have to try to add metal. Shrinkage allowance when making brass castings the old fashioned way can be from two to six percent depending on the method used to make the rubber mould. However, for skipping the rubber mould stage, and not knowing if the system might be automatically compensating for shrinkage, the old 'rules-of-thumb' do not apply. Regards, Paul.