Skip to content

Y-U Tetrahedron 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 tetrahedron puzzle which interlocks. Remarkably, it is also made from pieces which look like Y and U! The pieces must flex slightly as they go together, so PLA should not be used. The model in the photos is made from PETG and works great.

Around 2005, Viktor Genel invented a puzzle he called "Octetra". This puzzle has 6 pieces, one can assemble 4 pieces into an Octahedron (Y-U Octahedron) or assemble 4 other pieces into a Tetrahedron (this puzzle).

3D printing settings

Each piece is cut in half so that no supports are needed. Print 2 copies of TetraPiece, 2 copies of TetraPieceMirror and 4 copies of the (half) Upiece. I recommend a layer height of 0.15 mm or smaller for good sphere resolution.

IMPORTANT: All 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 4 perimeters.

The halves are then 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
  • Publication date: 2019/12/23 at 17:37





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!