Infinity Cube

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Infinity cubes have become a popular fidget gadget. They are typically an interlocking set of eight cubes that fold over onto themselves infinitely. This design is optimized for most printers and will print in place without supports.

There are several existing designs on Thingiverse; however, they don't provide the design files for customization. I will walk you through the design process and provide the design files and STL files for you to modify and print your own customized design!

Video Demo of Cube: https://www.youtube.com/watch?v=gpM8QhBmqXA
Complete Video Tutorial: https://www.youtube.com/watch?v=UlSd0zvG-_E
Instructable How-To Guide: https://www.instructables.com/Infinity-Cube-in-Fusion-360/
Hackster How-To Guide: https://www.hackster.io/mjdargen/infinity-cube-in-fusion-360-cfe43b

Print Settings

Rafts: No

Supports: No

Resolution: 0.2 mm

Infill: 10%

Notes:

The .STL file was generated with a Z-up configuration. The design was optimized to be printed with a 0.2 mm layer height and a 0.4 mm nozzle width.

It was designed to be printed with a 10% infill; however, you can increase the infill as much as you want if you want the cube to have a bit more weight. 10% infill is more than sufficient to withstand regular use and the occasional drop.

On a Makerbot Replicator+ with default settings, it took about ~2.5 hours to print and required ~30 grams of PLA filament (including a raft). A raft is not necessary; however, our printer is older and has poor adhesion so they were printed with a raft.

If using Ultimaker Cura to slice your file, be sure to set "Fill Gaps Between Walls" to "Nowhere" under the Wall settings to prevent the hinges/cubes from welding together.

Post-Printing

The design contains interlocking pins and sockets on the cubes/hinges. It should move freely right off the build plate but it will require some working in to loosen up the joints completely, particularly the two hinges that print vertically.

How I Designed This

This infinity cube was designed in Fusion 360. Since print-in-place parts can be tricky to perfect, there ended up being a few different revisions for this design. At first, the cubes had a rod that traveled all the way through the hinge. These rods ended up restricting the movement too much and would wear down over time. I then proceeded to try pairs of interlocking rounded pins. Eventually, I determined that creating conical pins and sockets on the hinge and cube would provide the most freedom of movement without sacrificing the strength or durability of the assembly.

I have provided the STL file along with the F3D Fusion 360 design file for you to customize your own design. If you are interested, you can also follow along with this complete walk-through tutorial: https://www.youtube.com/watch?v=UlSd0zvG-_E