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 Post subject: Rhombic 18 PuzzlePosted: Thu Aug 18, 2011 4:12 pm

Joined: Wed Dec 10, 2008 6:26 pm
Location: Boston area
Hello Puzzlers,

I'm pleased to introduce my latest puzzle, the Rhombic 18. Why 18? Because it has 18 axes of rotation, 12 through the faces of the puzzle, and an additional 6 axes through the four-sided vertexes. The idea for this puzzle came about as I was exploring possibilities for variations of my Ice-9 puzzle. Where Ice-9 is based on a 3-sided prism, Rhombic 18 is based on a four-sided prism. This then turns into a rhombic dodecahedron, giving Rhombic 18 two more turning vertexes than it might otherwise have as a "big brother" to Ice-9. Of course, being a face-turning rhombic dodecahedron at it's core, Rhombic 18 can also jumble.
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Rhombic18 green triad.JPG [ 181.67 KiB | Viewed 2743 times ]
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Rhombic18 pink triad.JPG [ 182.49 KiB | Viewed 2743 times ]
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Rhombic18 blue triad.JPG [ 195.24 KiB | Viewed 2743 times ]
Vertex turn:
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Rhombic18 vertex turn.JPG [ 181.29 KiB | Viewed 2743 times ]
Face turn:
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Rhombic18 face turn.JPG [ 191.32 KiB | Viewed 2743 times ]
Jumble turn:
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Rhombic18 jumble turn.JPG [ 197.91 KiB | Viewed 2743 times ]

Watch the video to see Rhombic 18 in action.

You can buy Rhombic 18 at Pitcher Puzzles on Shapeways. However, since it exceeds the Shapeways maximum file size, it must be purchased as two separate models. You can purchase set B here.

I hope you enjoy!
Dave

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Visit Pitcher Puzzles where you can buy the IPP award-winning RotoPrism 2, Fracture-10, and many, many more.

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 Post subject: Re: Rhombic 18 PuzzlePosted: Thu Aug 18, 2011 4:15 pm

Joined: Thu Sep 24, 2009 12:21 pm
Location: Chichester, England
Wow, it's like a Rua and the four fold DRD corners all in one! David, I am truly impressed. I really wish I could play with one, it would be extremely hard to justify the cost of the puzzle. Nevertheless, it is epicness at it's purest.

After watching the video it seems to be rather stiff. Is this just due to the tension, or is it something to do with the tolerances?

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3x3x3 single: 5.73 seconds.
3x3x3 average of five: 8.92 seconds.
3x3x3 average of twelve: 9.77 seconds.

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 Post subject: Re: Rhombic 18 PuzzlePosted: Thu Aug 18, 2011 4:26 pm

Joined: Mon Aug 18, 2008 10:16 pm
Location: Somewhere Else
WOW!

I love how the colors are grouped into four sets like that.

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 Post subject: Re: Rhombic 18 PuzzlePosted: Thu Aug 18, 2011 4:35 pm

Joined: Thu Dec 02, 2004 12:09 pm
Location: Missouri
WOW!!! This looks very very nice! I'll have to check out the video when I get home. YouTube is blocked here at work.

Carl

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 Post subject: Re: Rhombic 18 PuzzlePosted: Thu Aug 18, 2011 4:52 pm

Joined: Fri Mar 06, 2009 9:23 pm
Very nice! must be a bear to solve.

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--Eric Vergo

My Shapeways shop

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 Post subject: Re: Rhombic 18 PuzzlePosted: Thu Aug 18, 2011 5:06 pm

Joined: Sun Jan 02, 2011 6:48 pm
, woah, it's cool, and look's very fun I would like to have that in my collection look's very nice! Nice work !!

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 Post subject: Re: Rhombic 18 PuzzlePosted: Thu Aug 18, 2011 8:32 pm

Joined: Mon Jun 30, 2008 8:38 pm
Location: Russia
Excelent Puzzle!!!

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my Shop: ShapeWays, grigorusha Big Puzzle Sale: EBay

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 Post subject: Re: Rhombic 18 PuzzlePosted: Thu Aug 18, 2011 9:10 pm

Joined: Wed Jun 22, 2011 4:57 pm
Location: The land of dreams, coincedentally located in Alberta
Nice, but the colours can only be brutal to sort out in low light (I love Mefferts, except the official mefferts Megaminx has three near-identical shades of green ). The grouping idea is sound, but I'd hate to solve it outside on an overcast day.

Colour complaints aside, it's an awesome puzzle and you should be proud.

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3x3x3 PB: 38.9 seconds
Well, I accumulated puzzles without even trying this Christmas. Whoops.
(Bermuda 8 planets, Rex Cube, Master Skewb, London Natural History Museum keychain 2x2x2, Impossiball)

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 Post subject: Re: Rhombic 18 PuzzlePosted: Fri Aug 19, 2011 4:15 am

Joined: Thu Dec 16, 1999 9:31 am
Location: Kaunas, Lithuania
I like the symmetry and those natural twists. Perfect combination!

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"...we can't all be geniuses..."
The Rat (The Wind in the Willows)

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 Post subject: Re: Rhombic 18 PuzzlePosted: Fri Aug 19, 2011 11:12 am

Joined: Mon Aug 02, 2004 7:03 am
Location: Koblenz, Germany
How lame!
Just a puzzle with hybrid axis system.

Just kidding.
Quite an achievement.

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 Post subject: Re: Rhombic 18 PuzzlePosted: Fri Aug 19, 2011 1:59 pm

Joined: Wed Dec 10, 2008 6:26 pm
Location: Boston area
Thank you all for the comments! Here are a the answers to some things:
Luke wrote:
After watching the video it seems to be rather stiff. Is this just due to the tension, or is it something to do with the tolerances?
It is a little bit stiff, but still playable. With so many axes and the sharp angles involved it does need some care in making sure faces are aligned well before turning. The puzzle is lubed (with CRC silicone), but I've got the springs fairly tight in order to help minimize any tendency for pieces to pop.
Jared wrote:
I love how the colors are grouped into four sets like that.
Thanks, I really struggle with the colors I choose, and I find groupings like this to be more aesthetically pleasing (to my eye) than more random placements. Also, it does help make it easier to distinguish shades of the same color since having them right next to each other (rather than on the other side of the puzzle) makes it easier to see the differences.
Drake wrote:
woah, it's cool, and look's very fun I would like to have that in my collection
Thanks for the comment! It is easy to add to your collection, just visit my Shapeways shop! (Apologies for the shameless plug...).

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Visit Pitcher Puzzles where you can buy the IPP award-winning RotoPrism 2, Fracture-10, and many, many more.

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