Summary

This is a sign that says "Ingen Reklam Tack!".
If you live in Sweden you mount it next to your mailbox to avoid receiving mass marketing mail.

Pause the print a few layers before the top layer and switch filament. This creates a nice two-tone effect and makes the sign more readable.

Created in FreeCAD. The design file is posted together with the printable STL file, for those who want to tweak the design.