Helical Dice Tower

A dice tower designed in Fusion for FDM printing. Two ramps wind around a central core, 180 degrees apart, with small tumble ridges every 30 degrees. Dice drop through a funnel lid, bounce down both ramps and leave through an exit window at the bottom onto a walled tray.

The outer shell is perforated with 60 hexagonal slots, each 8 mm wide, which is narrower than any die, so dice cannot escape but you can see them fall. Measured in the CAD, the ramps leave 33.6 mm of clear height at their tightest point (1.5 times a 22 mm d20).

Three printed parts: the tower (one piece, 250 mm tall, fits a 256 mm bed), a bell-shaped funnel lid with a locating ring, and the base tray with a 6 mm centre pin that locates the tower.

REVISION B (2026-11-08): the first version would have needed supports under the ramps inside the enclosed tower, where they could not be removed. The ramp undersides, exit windows, slots, pin hole and funnel were redesigned so every surface is within about 45 degrees of vertical. Facet analysis of the exported meshes in print orientation: tower 352 mm2 of marginal facets (44.6 to 45 degrees) out of 239,000 mm2, funnel (printed upside down) 0, tray 0, and no flat ceilings anywhere. The tower prints upright; the funnel lid must be printed upside down (rim on the bed).

Status: Designed only. Not sliced in a slicer and not printed; nobody has tested that dice tumble reliably down the ramps or leave through the exit windows. Overhang surfaces near 45 degrees print rougher than vertical walls, so use good part cooling. All dimensions are provisional.