If you're like me, you have way too many spindowns from pre-releases and other events. I wanted a nice stable way of using them as counters on a card, so I made this little d20 holder! It features a gap near the bottom so you can slide it onto the side of a card and move it with the card, but you can also just sit it on top if that's your jam.
Print it on its flat side.
Designed in tinkercad by using the d20 section from Sigismond0's fantastic life counter.