UPDATE 30. December 2018:
I added a ned lid (v5) with more tolerance for less fideling after printing as the other one is to tight on many printers:-)
So i liked the concept, but not the design that i could find, so i made this.
feel free to make some nice gifts and personalice with some text.
Kun = Only
Åben = Open
Søndag = Sunday
Print 2 of the lid and the and a lock_pin, the lock_pin needs a smal skrew (m3) and a washer and its good to go :-)