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 Post subject: Tracker Ball by OSKAR & BRAM
PostPosted: Sat Jul 20, 2013 5:50 am 
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Hi Twisty Puzzles fans,

Tracker Ball is based on an idea by Bram Cohen. Tracker ball is a twisty puzzle that looks nothing like a Rubik's Cube. It has one big spherical gear with 20 teeth (icosahedron) and three small spherical gears with 8 holes (octahedron). The big sphere gear rolls like a tracker ball supported by the three smaller sphere gears that act like ball bearings.

In its solved state, the green tooth of the tracker ball is inside the green hole of one small ball, the red tooth of the tracker ball is inside the red hole of the second small ball, and the blue tooth of the tracker ball is inside the blue hole of the third small ball.

Watch the YouTube video of the new Shapeways version.
Watch the YouTube video of the original version, presented by Bram Cohen.
Buy the puzzle at my Shapeways Shop.
Read more at the Shapeways Forum.
Check out the photos below.

Enjoy!

Oskar
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 Post subject: Re: Tracker Ball by OSKAR & BRAM
PostPosted: Sat Jul 20, 2013 5:59 am 
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This should belong in a new category called roll-ey puzzles...

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 Post subject: Re: Tracker Ball by OSKAR & BRAM
PostPosted: Sat Jul 20, 2013 7:58 am 
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In the video featuring Bram, he says "The large central one is an icosahedron, and the 3 around it are octahedra. So they have triangles in common and that's how they are able to roll against each other"

So would this puzzle work with an icosahedron and x amount of tetrahedra? Or an octahedron surrounded by tetrahedra? Could it be reversed so that a central octahedon is surrounded by icosahedra etc?

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 Post subject: Re: Tracker Ball by OSKAR & BRAM
PostPosted: Sat Jul 20, 2013 8:20 am 
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JackRTully wrote:
So would this puzzle work with an icosahedron and x amount of tetrahedra? Or an octahedron surrounded by tetrahedra? Could it be reversed so that a central octahedon is surrounded by icosahedra etc?



Maybe... Octahedron in the middle surrounded by icosahedra and tetrahedra and more.

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 Post subject: Re: Tracker Ball by OSKAR & BRAM
PostPosted: Sat Jul 20, 2013 11:12 am 
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Oskar, to answer your question from the video - I would pay up to about $30 or so. Higher than that seems a little steep to me.


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 Post subject: Re: Tracker Ball by OSKAR & BRAM
PostPosted: Sat Jul 20, 2013 12:47 pm 
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Location: Marin, CA
JackRTully wrote:
In the video featuring Bram, he says "The large central one is an icosahedron, and the 3 around it are octahedra. So they have triangles in common and that's how they are able to roll against each other"

So would this puzzle work with an icosahedron and x amount of tetrahedra? Or an octahedron surrounded by tetrahedra? Could it be reversed so that a central octahedon is surrounded by icosahedra etc?


Some of the faces would result in overly restricted motion, and of course some of them would result in overlapping spherigears, but there is a fourth 'missing' octahedron which should go right at the very top of the thing. Adding that one in and switching to a symmetric exoskeleton would be a good way to prevent 'cheating' and also possibly make the puzzle look a lot nicer.


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