Thanks GOC for your help. In terms of print scaling, I don't necessarily need to print to a scale (IE 1:100) but if I split the model in uneven parts, I need each part printed out to the same scale. For example if I split a 30m tall building into two parts, one which is 20m tall and the other part is 10m tall, I want to first print to come out twice the size as the second. My fear was that if I split the model, when it gets put into the printers program it will just scale to fit, therefore both parts of the building will print out at the same size, even though in reality the second part should be half the size of the first. Does that make sense?