Round die

thingiverse

This spherical die selects a number by employing a weighted mechanism inside. To achieve the perfect size at 30mm, insert a 3/8 inch metal sphere for optimal results. When your sphere measures 25 mm, use a 5/16 inch metal ball to generate precise outcomes. If your design ranges from 18 to 23 mm, you can effectively utilize a BB or slightly larger sphere. Note that I have not tested this smaller size; my smallest creation was the 25 mm model. To complete the print successfully, drop in the metal sphere when it reaches 50% to 60% completion and then finalize the printing process.