Here is my take on a normal set of DnD dice, with the added option of multi material printing. If you would like to print them normally, simply download the die model and print it normally. My best settings are listed below, however these were just used to get the best possible dice, and the brim is the only setting that I would say is required to get a correct print.
If you would like to make the numbers a different color, use both the die model and the corresponding numbers model. Keep in mind that you must already have a multi-material setup, and it is recommended to practice simpler multi-material prints before this one to make sure it works (My MMU2S took ~8 months off/on to get it to where it is today). The number models themselves look oddly extruded because the print was much more successful when both colors were printed in closer to the same amount of plastic.
Printing these models without support has created the best surface finish, but the D20 is especially difficult to print the bottom numbers well since they are on a great overhang. Ultimately, the settings I found to work best was slowing both the external and normal perimeters to 10/20 mm/s, and include an extra fan blowing from the back. Also, make sure the purge block is out of the way (not sure if this is still needed with the external fan, but it works so I won't mess with it).