DM Screen Card Rail

I bought an initiative tracker that uses character cards to represent players and monsters/npcs. The included clips didn't function as well as I would have liked since they were wide enough to hold a single card and were very thick, keeping me from folding my DM screen. So I made this one. It is a single rail that fits on the top of your screen that holds cards (of any standard thickness). The cards can easily be repositioned or reordered as necessary. Single color print, two rails. When I load this model, I have to rotate the rails to fit on the build plate. Rails are approximately 285mm long and 18mm tall. Designed to fit on screens that are 4mm thick. I have a version for screens that are approximately 7mm thick if anyone is interested. This is my first original model design and upload, so I welcome suggestions on making it better