This is a 2 inch x 2 inch card holder for use in display boards or anyplace you want to mount a card holder.
I added a FreeCAD file of it, although some of the features were slightly changed but it functions the same.
This doesn't require any support material. The undercut will print without any issue.
Be sure to print this part standing upright, not lying on it's back.
A good friend expressed a need to hold 2 inch x 2 inch business cards. I took one card and wanted to make the holder not look like just a block of 3D printed plastic on the display. In order to allow for easier card insertion, the tops are chamfered to reduce binding.