This paper model is a Dice Tower, designed by papermakeit. In many boardgames and wargames, a nodal point is represented by the dice, that must be rolled somewhere directly on the table, risking to be confused among other elements in the game.
A Dice Tower is a device to cast the dice avoiding to hit the structures and the miniatures standing on he boardgame. It is useful also as a compliting part of the structures themselves, depending on the theme of the game (i.e. medieval age in the present case).
The Dice Tower is built in three modules: the top, the floor, the basement. In this way the final model could be easily modified changing parts of it. One nice option is to add more than one floor, creating a taller Tower.
I suggest to use a strong paper to print on (I used a 210g/m2), because the Tower will end to be heavy and the structure needs stability.
Pay attention to the print size of every sheet, sometimes the software tends to resize the drawing for better fitting the sheet margins: in this case try to force the printer to not modify the size. You could also import the file into a graphical software and then print only the pieces you are interested to. [via Author]
Please note: the floor needs a transparency film to be used to close the stairs, otherwise the dice will probably roll out, not reaching correctly the basement.