Couldn't find a printable document holder to mount on a wall, so i designed one by myself.
It suits a good amount of A4 documents (or smaller).

It has a honeycomb design to use less filament while still being stable enough.

You can mount it to the wall with 2 countersunk screws (i used 4,5x40mm).

I printed it in PLA with the honeycomb side on the print bed, which needs some supports. If you print it in a standing position, you should only need support for the upper cross brace with the mounting holes.