The idea for this comes from spiral ramp for wooden train tracks by ucn.

I did not have the option of making wooden bases, so I recreated the same set with the measurement documented by ucn on printables so that they can be completely printed.

Each tower is labelled L1 to L2, A to H.

On top of each tower there's a little cylinder knob. The stackable tower has a cylinder hole that stacks on top of the cylinder knob. Theoretically you can keep stacking to make taller spiral, but I have not tried it, and not sure if it will be stable.

You can refer to the original article by ucn for layout instruction.

You will need the following at least the following:

2x L1

1x each L2 and L3

1x each A, B, C, D, E, F, G and H

5x stackable tower

I grouped towers A-H in a single plate because the file is clearer this way. You may or may not want to print them together or separately.