Here's my take on a dice tower. I really liked the look of all those medieval towers, but also wanted to be able to watch the dice going down. So I designed my own.
This design uses a piece from a plastic bottle for the outer wall, diameter 87mm - length 170mm with a straight wall. I used a Dr.Pepper 1,5L bottle. To get the opening for the door, you can place the bottle on the base, then trace along the inside of the door using a pen or pencil. Then cut away the opening.
Note: If the bottle has a slightly different diameter, you can scale all the parts by X=d/87, with d diameter in mm. The required length, in mm, would be 170*X.
The little knight is something i liked for decoration in the window behind the entrance. It was sliced and scaled from the model by bs3 (https://www.thingiverse.com/thing:1239427). But it's optional, you can leave it out or paint or put something else in there to personalise the tower. The measures of the window are width x height x depth:26x45x7mm.
As for printing, I gave all the parts steep angles, so I was hoping they would print without much support, but they still need some, particularly the staircase. It's all easily removed though, I had no problem cleaning the parts.
Edit: Updated the Spiral.stl. The mesh is a lot cleaner now.