My original 3D printed dice tower design, originally envisioned around 2016. First version was on a small M3D printer and took FOREVER to print. This has undergone revisions to the middle layer and the exit ramp and is now in a condition I feel worthy of sharing.

Print 1x Top Chute, 1x Exit Ramp, and 1-(as many as you like) middle layers (at least 3 IMO).

Stack the middle layers on the Exit Ramp rotated at 45° from the previous one. This will give a cross X+X pattern to insure the dice hit as many baffles as possible on the way down. You can literally print as many middle layers as you like and stack them as high as you want. Put the Top Chute at the top, this directs dice to the center of the topmost middle layer and starts the tumble.

Print in the orientation provided and no supports will be necessary. Top Chute and Middle Layers upside down. Exit Ramp right side up.

I printed at about .40mm layer height on my Ender-3 Pro using transparent filament (as seen in the sample). I place the tower inside a large dice tray to catch them.

For those without a 3D printer: I uploaded to https://www.treatstock.com/ to see how much it would cost and for me, with 3 middle and 1 each of the top and bottom, was about $25 shipped.