calendar hanger
thingiverse
It is hard to hang any calendar or prints papers A3 on the wall, but here is customizable hanger.
Download Model from thingiverse
With this file you will be able to print calendar hanger with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on calendar hanger.