A dungeons and dragons stand for card stock. Just press your card into the groove and you should have a little standey. I have printed about 20 of them and use them for quick monsters in a pinch.
There's a 1x1 low profile, a 1x1, a 2x1 and a 2x2 model available.
dnd2x1.stl | 562.0KB | |
dnd_2x2.stl | 637.9KB | |
dnd_stand.stl | 480.0KB | |
dnd_stand_tall.stl | 486.7KB |