It is very difficult to print exactly to the edge of a sheet of paper/card, so to achieve this, it is necessary to print a slightly larger area than is needed and then trim the paper/card down to the required finished size.
ɪɾ ɪz vˈɛɹi dˈɪfɪkəlt tə pɹˈɪnt ɛɡzˈæktli tə ðɪ ˈɛdʒ əvə ʃˈiːt ʌv pˈeɪpɚ slˈæʃ kˈɑːɹd, sˌoʊ tʊ ɐtʃˈiːv ðˈɪs, ɪɾ ɪz nˈɛsᵻsɚɹi tə pɹˈɪnt ɐ slˈaɪtli lˈɑːɹdʒɚɹ ˈɛɹiə ðɐn ɪz nˈiːdᵻd ænd ðˈɛn tɹˈɪm ðə pˈeɪpɚ slˈæʃ kˈɑːɹd dˌaʊn tə ðə ɹᵻkwˈaɪɚd fˈɪnɪʃt sˈaɪz.