Skip to content

Y-U Octahedron Puzzle

Creation's quality: 0.0/5 (0 votes)
Evaluation of members on the printability, utility, level of detail, etc.

3D model description

A ball octahedron puzzle which interlocks. The assembled puzzle is quite stable and can be tossed around without fear of falling apart.

It is made from four simple pieces: One Y and three U's. The pieces must flex slightly as it goes together. A copy made from PLA was a failure: too brittle. A second version made from PETG works. Do not make this model from PLA, it will break.

Assembly is confusing but not difficult once you know the trick. Do not force the assembly or you can break the puzzle! To assemble with minimum force you need to move all three U's at the same time. The same move in reverse takes the puzzle apart.

3D printing settings

Each piece is cut in half so that no supports are needed. Print 2 copies of the (half) Ypiece and 6 copies of the (half) Upiece. I recommend a layer height of 0.15 mm or smaller for good sphere resolution.

IMPORTANT: The U pieces are under stress during assembly and I recommend strengthening their joints. This is most easily done by increasing the number of perimeters. I recommend at least 4. This will keep the pieces from breaking. The Y piece is not under stress and does not need to be strengthened (the yellow Y in the photos is actually made from PLA).

The halves are glued together with superglue. Each piece contains holes for alignment. After cleaning the holes out (if necessary) take a scrap piece of 1.75 mm filament. Insert the filament into a hole and cut it off such that about 3 mm is sticking out. After each hole has a piece of filament, fit the other half in place. If the fit looks good, remove and glue the halves together.

  • 3D file format: STL
  • Last update: 2020/01/07 at 16:01
  • Publication date: 2019/12/22 at 17:34





Issue with this design? Report a problem

Best sellers of the category Various

Add a comment

Would you like to support Cults?

You like Cults and you want to help us continue the adventure independently? Please note that we are a small team of 3 people, therefore it is very simple to support us to maintain the activity and create future developments. Here are 4 solutions accessible to all:

  • ADVERTISING: Disable your AdBlock banner blocker and click on our banner ads.

  • AFFILIATION: Make your purchases online by clicking on our affiliate links here Amazon or Aliexpress.

  • DONATE: If you want, you can make a donation via PayPal here.

  • WORD OF MOUTH: Invite your friends to come, discover the platform and the magnificent 3D files shared by the community!