Bisect Cube puzzle by Osanori Yamamoto

by richgain, published

Bisect Cube puzzle by Osanori Yamamoto by richgain Oct 1, 2011


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I love designing, making, solving and collecting interlocking 3D puzzles. I have lots in my microcubology shop on Shapeways site but most of them will not print well on current RepRap machines because of the need for tight tolerances and support material for overhanging blocks.
I discovered this brand new puzzle here http://puzzlewillbeplayed.com/553Ring/BisectCube/ at the excellent 'Puzzle Will Be Played' website and immediately realised that it was printable on my new eMaker Huxley machine. It took three goes to get the tolerances right but this version prints just right for me. I have based the puzzle on 10 mm cubes and used a 0.2 mm offset on every face.


Print the three parts and then assemble them into a bisected cube, as shown in the photo. A very nice little puzzle challenge as well as a good test of printing accuracy.
The STL file was exported directly from my favourite puzzle design software, Burr Tools, which allows offset to be specified prior to exporting.

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Fits quite snugly. I think some chamfering would make this so much nicer on the hands. I'm going to do that manually with a knife right about now.

Amazingly challenging for only being 3 pieces. Loving these burr puzzles I've been printing so far.

What was the tolerance used between pieces?

You may have noticed that the filename is BisectCube_10_0_0.2_group.stl. It takes the name from the Export function in BurrTools, an excellent free puzzle designing program.
The 10 means 10 mm unit cubes.
The 0 means 0.0 mm bevel.
The 0.2 means 0.2 mm offset tolerance.
This was one of my very early attempts at using this program, from a time when my printer wasn't tuned as well as it is now.
I now routinely lower my tolerances figures to somewhere in the range 0.08 to 0.10 mm, depending on the style of puzzle and the printing resolution (fine resolution prints slide more smoothly).

That actually is helpful. I was using this other print to see where my Replicator 2X stands on tolerances: http://www.thingiverse.com/thing:34038/

My printer probably needs some calibration, since #0 listed here did not fit at all. #1 fit (tight) and #2 is where it started getting loose. However, with the info you have given me, I think Ill test your print as well and see whats happening. :)

Tolerance test

Fun little puzzle, but not quite as difficult as http://www.thingiverse.com/thing:23279http://www.thingiverse.com/thi...

Apparently Impossible Cube

ok.. I havent been able to solve this puzzle.. where can I figure out the solution? I tried searching online, but did not come up with anything.. :(

OK, here are some clues to help you.

You obviously can't solve the puzzle without rotating the pieces. If you haven't been doing that, go back and have another go.

Orient the ring so that it looks like a lower case 'h'. Push one of the pieces up from below into the cross bar and lower left corner and carry on up. Rotate the piece 90 degrees clockwise and then slide it up to the top left hand corner.

Now drop the other piece down into the hole, spin it round 270 degrees, and you're practically done.