A dice tower from two parts that both print flat – the ramps sit half on the back shell and half on the front plate and interlock when assembled. No supports anywhere, and nothing to clean out of a 200 mm shaft.
Channel size, ramp count and overlap are free, so the tower can be built around the dice you actually use rather than around a standard d6.
The tower is a back shell and a front plate. The ramps sit on both: half on the shell, half on the plate, interlocking when the two are put together. That is what makes the whole thing printable flat with no supports – a one-piece tower needs support material inside the channel, and cleaning that out of a 200 mm shaft is a job nobody wants twice.
| Inner width and clear depth | At least four millimetres more than the biggest die. For a 20 mm d20 that means 24 mm and up. |
| Ramps | More ramps mix better and make the tower taller. Four is a good start; above six the dice lose so much energy that they dribble out rather than roll. |
| Ramp overlap | How far each ramp reaches into the channel. Below half the die falls straight through and is not randomised; above eighty per cent it jams. |
| Drop between ramps | The free fall from one ramp to the next. This is where the tumbling happens. |
Optional and worth having: without it a die leaves the tower and carries on across the table. The rim height decides whether it stays in – 12 mm is enough for a d6 rolled gently, 18 mm for a handful of dice thrown hard.
Print both parts flat, no supports. The data table checks the finished height against your bed and says outright if it will not fit – a tower is the one part in this module that regularly outgrows a 256 mm machine.
PETG is a good choice: a tower gets knocked off tables. If it will live outdoors at a convention stand, print in ASA.
This page carries the essentials. The detailed sheet is in German: documentation. Every control here is a number, a slider or a choice, and the German page uses the same order.