Print-on-demand makes it possible to offer physical books without ordering a large print run, but each copy has a manufacturing cost. Review the provider’s calculator using realistic page count, paper and color settings. A full-color interior can change the economics significantly.
Run the estimate again after formatting, because final page count may differ from the draft. Check the effect on minimum list price and royalties. Early cost awareness helps authors choose a suitable format without redesigning the book at the last minute.