These are some small card holders that I made in Bambu Studio to hold the character and enemy tokens in the DnDoggos RPG. They are basic shapes that are sized roughly enough to hold standard-weight paper folded in two, as per the game design. When printed at 100%, the small holders ended up having a small glob of filament at the top which, once pressed into the gap, created enough pressure to hold the paper. The large holder didn't have the same issue when printed and, as such, could probably be shrunk down to 95% or so in order to have enough tension on the paper.

Aside from that, it's a very basic print, so use whatever print height and infill you like. The models in the pictures used a .20mm height with a couple walls.