The Wandering Tower (Die Wandelnden Türme) upgraded Towers

Besides the obvious advantage of plastic over cardboard, these have the advantage of being actually round, instead of five sided. That improves the ease of stacking the towers during the game. The castle itself has a small side piece that should slot exactly into the top of a tower, adding just a little stability (because if the castle fell over and was full of wizards then chaos would ensue).

Remixed of a couple of other models - resized added and subtracted bases where necessary for game play.

You need to print:

9 X Tower Base

4 X Blank Tops

5 X Raven Tops

1 X Castle

Gluing the tops to the base with superglue worked fantastic to me. Painting made them look great.