A simple two piece through-door vent for your bathroom or any other room that needs a bit of extra ventilation even when the door is closed.

When assembled properly the fins are oriented in such a way that one cannot see through the vent/door.

Drill a hole (or multiple holes) through the door of your choice with a 50mm (2 inch) hole saw then glue the two pieces in place. Since the cross section of the vent is relatively small, more than one is required if you have an active fan ventilation.

Slicer settings I have used:
0.2mm layer height

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Happy 3D printing!