A classic design for those of us who were kids in the '90s. I used to draw this “S” on everything! Print with support for back of the clip and a brim. Print with PETG, ASA or ABS, 0.20mm layer height, 5 walls, no infill. Clip holds ~10 cards and some cash, “beefy” design which works very well.
The author marked this model as their own original creation.