johnsonm / hanoi

3D printable towers of hanoi set

Parametric Towers of Hanoi sets

hanoi.scad

Printable six-disk towers of Hanoi set.

Modifications

While this set is designed to work for disk thickness down to 3mm, in practice even the 5mm default thickness is about as thin as is comfortable to manipulate. Because this set is designed to preserve aspect ratio, you will need a large printer to print this set above the default 5mm disk thickness, or you will need to explicitly change the aspect ratio.

If you print posts (the default), the post_radius should not be less than 5mm; 6mm is recommended.

If you do not print posts, you'll have to drill holes in the bottoms of whatever you use for the posts. You can set a non-zero post_offset to print a pocket for the posts (in which case you will almost certainly want to use a lathe to exactly center the hole in the rod), but make sure there is some room between the bottom of the pocket and the head of the screw so that the post doesn't easily tear out of the base. If you do this, you might need to increase base_height to accommodate the additional thickness required. When rendering, OpenSCAD will print out the post height it expects so that you can cut rod to the appropriate size for the posts. You may want to chamfer or round the top of the posts to make it easier to slip the disks on the posts.

Note that in OpenSCAD, F5 preview will show a stack of disks on the base (and the posts, if not printed) as "background", which can help you make sure that the parameters you have chosen will work well.

You can print an extra set of discs in a second color for two color towers of Hanoi. If you do that, add at least two ring thicknesses to the size of the posts.

panoi.scad

Printable eight-pyramid towers of Hanoi set.

Prints in two alternating stacks on the printer. Preview shows the hanoi-style stack. These are intended to be played by setting up the stack and moving pyramids from stack to stack across three locations, using the same rules as disks. Print two or more sets in different colors for multi-color towers.

Modifications

Almost everything about this set can be customized.

• The count is the number of total pyramids to print. The odd-numbered pyramids are in negative Y, and the even-numbered pyramids are in positive Y. They are all stacked largest on the bottom and smallest on the top for play, but they are of course printed the other way around.

• The sides says how many sides to print. 60 will be close enough to a cone as makes little difference when printed. Three to six sides should be generally playable, but go ahead and experiment.

• The base is the diameter of the circumscribing cylinder around the smallest pyramid, and for an odd number of sides will not correspond to any specific measurement of the objects produced.

• The thickness is the X-Y thickness of the shells, so that the actual thickness of the shells in the object will be tan(angle)*thickness

• The angle is the external angle, the slope of the pyramid away from vertical. 20 is a very tall pyramid; 45 is a squat pyramid and is probably as large an angle as you want.

If you try to split and re-arrange in the slicer, be careful because the inner pyramids are unlikely to rearrange with the outer ones. This is a case where it is better to rearrange in the model than in the slicer.

Copyright 2018 Michael K Johnson Use allowed under Attribution 4.0 International (CC BY 4.0) license terms https://creativecommons.org/licenses/by/4.0/legalcode