BACKGROUND: Although much has been written about techniques for making a good stoma, little has been described regarding how to excise a trephine that will perfectly fit a given end stoma. METHODS: A reproducible technique for making a stomal trephine to a precise fit for each stoma is described. RESULTS: More than 20 stomas have been made with good results. CONCLUSION: The skin trephine should have a diameter approximately two-thirds of the width of the crushed bowel end.