Paper Slot for letterboxes
thingiverse
This is a letterbox slot for paperbins. I've drawn it on European size:32mmx280mm, but presumably it can be scaled. Because it was too long for me to print at once I've divided it in four pieces for Top and bottom. The bin or other material can then be sandwiched/glued in between.
Download Model from thingiverse
With this file you will be able to print Paper Slot for letterboxes 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 Paper Slot for letterboxes.