Khay Đựng Thư Treo Tường (Wall Mounted Mail Tray)

This mail tray holds items with a format of up to A4 (~216x280mm). 

It uses three 3mm pan head screws to attach it to the wall.

If you run out of filament for the top part (as I did, see the second picture) or you don't want to print it fully, you can print the fastener (blue parts in the second picture).

I recommend printing it with no top and bottom layer but with some infill pattern you like. 

OnShape: https://cad.onshape.com/documents/ef9aa8a2aa11fb34021583e9/w/9210ef7ed84feac2ef066146/e/0a1d623269184366a8f819b0?renderMode=0&uiState=66c5ac924a958e0d085b240f