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Baffling Puzzle Ball

by ricswika Nov 5, 2015
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I'm glad you created a nice .STL for this puzzle, but it is unfair and inaccurate to call it a "totally new, unpublished mechanism". You can find this in Chap 12 of Stewart Coffin's book "The Puzzling World of Polyhedral Dissections," which is also available online: https://johnrausch.com/PuzzlingWorld/chap12.htm

You are right, that is the same mechanism as in "The Puzzling World of Polyhedral Dissections" (great link) and it was published before 2013. So I removed the word "unpublished" from the description. Thanks for the info. It is "totally new" to me and in reference to my other puzzles.

The entire family loves this puzzle, Everyone wanted to succeed based on the first picture only.
The designer recommended a few percent scale down in the Z direction for an easier puzzle. It is a little bit easier to push the last piece in with 95% Z scale, but there is less traction between the pieces, so it is harder to keep the other 7 together. I will try to make it as big as possible, my Monoprice Select Mini printer can go up to 110x110x110 mm.

I love the way this puzzle locks together after assembly! I've tried several of this type and they're loose and rattle apart if not held just so. This one can be used to play catch and still remains tightly locked together. Has anyone scaled it up, and if so, does it scale well?

Thank you. It should scale up fine. There's no clearance between parts to grow when you scale them. The parts flex a tiny bit to fit together. I think that must be what holds them tight. If there was a clearance built in, when you scaled up it would probably make the parts fit loosely, but I don't see that happening here. It would be interesting to see how big you could go. Of course it also depends on how good your printer can make the parts.

I printed one scaled to 150% and the result was perfect.

Have you designed entirely this design or you adapted for 3D printing?
It's a very nice puzzle =)

I designed the puzzle in Blender from scratch and never saw one just like it, but have seen the idea used before. I have studied puzzles since I was a child and know it is called a coordinate motion puzzle because you have to coordinate the motion of all the pieces to make it unlock. It seemed natural to do it using the X, Y and Z axis plus and minus.