The tower, it represents a large ruined dwarven gate where the die falls through the head, rolls over the battered and destroyed door and falls into a tray with typical dwarven culture ornaments.
The tower is optimized for easy SUPPORT-FREE printing in FDM printers. The minimum required build size for your 3D printer is 18cm x 16cm x 16 cm, so it prints on most printers, even the smaller ones!