Very simple badge holder. In my case, I have barcodes both front and back that I use all day at work. Many off the shelf holders would require me to remove the badge from its holder to scan the rear code. I designed this holder to grip the card tightly enough that it won't slip out while still allowing me to swipe my badge and scan the front. I now no longer need to take it out of the holder to do my job which speeds things up and keeps me less annoyed.

Please note, this will impart a slight bend to the card. This is done to put the assembly in tension and grip the card better. The bend is not permanent, and will release as soon as you remove the card from the holder. But it will be ever so slightly curved when in use.