For example for an A3 sized trimmed print there is an SRA3 paper size (SRA3 is 450 mm/320 mm, A3 is 420 mm/297 mm). If you are printing in the A series, there are matching paper sizes. If you explicitely need to trim the print -in case of a custom print size or edge to edge graphic-, you need a larger paper size to be printed than the final output -so you can trim the paper's edges off. Meaning cropping marks are unnecessary if you only want to print regular graphic with a safe area (parts not closer to the paper's edge than a certain amount, like 2-5 mm). That is, when you'd want an edge-to-edge print with no white borders. Captain obvious here, crop marks are useful only when you will crop the print.
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