dice tower 3d model

Create a fully functional 3D printable dice tower inspired by One Piece. Height 28 cm, diameter 11 cm, wall thickness 3 mm. Primary priority: internal gravity-driven mechanical system. Inside: one continuous helical ramp (NOT staircase), 5 full clockwise rotations around a 24 mm central pole. Ramp width 20 mm, thickness 4 mm, 2 mm side rails. Slope 15–20 degrees. Minimum 18–22 mm vertical clearance between each spiral turn. Open air gaps between rotations. No merged or fused layers. Dice (20 mm) must roll freely from top to bottom without obstruction. Top: 30 mm funnel entry. Bottom: gothic arched exit to rectangular dice tray. Exterior: pirate fortress cylinder with battlements and shallow (max 2 mm) Straw Hat bas-relief sculptures. Model must be hollow, manifold, watertight, FDM printable, no internal supports.