This model is a meant to hold trading cards in toploaders and allow you to mount them on the wall. This design fits standard 3x4" toploaders. I personally use the UltraPro toploaders but any that are 3x4" should work!

To attach them to the wall, I a single command strip on the back and the “window” part of the design allows for easy access to remove the command strip.

I printed these designs on an Ender 3 Pro without supports.

If you have any questions feel free to leave a comment!