Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:3686045.

This dice has no 1 or 20, but it has an extra 9 and 11. For the player that is a hour later and has forgot everything at home

The "Copy of" file has inset numbers so it will roll much better. Ironically this makes it a better dice, which is somewhat against the original purpose.

This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/daSf04myBNY