Printable Interlocking Puzzle #3 - Level 4 by Bram Cohen
by richgain, published
Following the release of PIP#2, I was contacted by Bram Cohen (puzzle designer and author of the BitTorrent protocol) asking whether I had found any printable interlocking puzzle cube designs with a level higher than 1, i.e. needing more than a single move to take the first piece out.
This sounded like a great challenge and I set about about trying to design one but then Bram beat me to it - not once but twice. As Bram commented in his email, " the main thing causing difficulties is that the printed bottom of the pieces can't be facing the outside directly, because then they can just be pulled off as the first move, but because the bottom must by definition have the most voxels, putting those on the interior makes it very hard to fill up all the external voxels and not stuff shut the internal voxels."
His first attempt was a level 2 puzzle cube but that was quickly superseded by this very clever level 4 design.
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I'm afraid I didn't make them in OpenSCAD but the good news is that the software I use is parametric. Grab yourself a copy of Burr Tools, a free burr puzzle designing and solving application. Then download the .xmpuzzle file which I have uploaded here and load it into Burr Tools. You can then use the export STL function to create new files with any cube size, bevel size and offset tolerance.
Alternatively, for a simpler fix try scaling the puzzle up in your slicer - this will have the effect of scaling up the offset and making the pieces looser.
If you made these in something like OpenSCAD, then would you be willing to share your code file? On my printer these pieces are really tight and I'd like to adjust the clearance and try to print again.
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Give a Shout Out
1. Print at a fine resolution so that the sides of the pieces are as smooth as possible.
3. Design a new version with a level higher than 4.
4. Feel smug.
Completed 1 and 2.
Still working on 3 and 4.
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