This is a quick and simple business card holder. It could be used to hold a small number of cards for handing out, but it's more intended to hold a card someplace where you will find it when you're looking for it later.
What I use them for is to hold reminder cards from my dentists and doctors of upcoming appointments. I stick a piece of magnetic tape on the back and it gets stuck to the refrigerator. Optionally they can be mounted to a hard surface with vhb tape, or print a bunch and bond them together in an array if you want an information board.
My experience is that different printers leave different sized extrusion widths, and the space a card is supposed to fit here is sometimes a bit less than the width of a business card. Feel free to scale up X or Y as needed to get a good fit for your use. I.e. if you're putting up a permanent display, you may not want to increase the dimensions at all. If you are looking to make this hold multiple cards, you may wish to grow the width by several percent. I generally print these in PLA because where I'm planning on setting them heat sensitivity isn't generally an issue. If you're going to have an information board of some sort in your car, or a shop w/o cooling, you may wish to print in something with a higher glass temp such as PETG, ASA, etc. Also feel free to remix. If you are interested, ask, and I'll share a link to the TinkerCAD model that can be copied and modified. Perhaps you want a deeper opening than the sloped setup provides for.