Online since 2002. Over 3300 puzzles, 2600 worldwide members, and 270,000 messages.

TwistyPuzzles.com Forum

It is currently Thu Jul 24, 2014 3:24 pm

All times are UTC - 5 hours



Post new topic Reply to topic  [ 27 posts ] 
Author Message
 Post subject: Master Rex Cube
PostPosted: Wed Oct 23, 2013 4:18 pm 
Offline
User avatar

Joined: Fri Dec 28, 2012 1:50 pm
Location: Near Las Vegas, NV
Hey guys,
Today I'd like to present my newest puzzle, the Master Rex Cube!
VIDEO
Attachment:
File comment: Master Rex Cube: View 1
DSC00325.JPG
DSC00325.JPG [ 1.5 MiB | Viewed 3538 times ]

Attachment:
File comment: Master Rex Cube: View 2
DSC00326.JPG
DSC00326.JPG [ 1.63 MiB | Viewed 3538 times ]

Attachment:
File comment: Master Rex Cube: After 1 turn
DSC00328.JPG
DSC00328.JPG [ 1.54 MiB | Viewed 3538 times ]

This puzzle is a corner-turning cube which has 5 layers per axis:
Attachment:
File comment: Master Rex Cube: Turning
DSC00327.JPG
DSC00327.JPG [ 1.43 MiB | Viewed 3538 times ]

However, like the Rex cube, all of the cuts are curvy and all of the cuts still intersect at the corners. This makes it have a very elegant look and introduces some interesting piece groups.

To be honest, for awhile I thought this puzzle was not possible. This is because of the way that the cuts work. If the cuts were too shallow, it would over-complicate the mechanism and make it very unstable. However, if the cuts were too deep, the mechanism on the edge pieces would disappear. Trying to fit not-too-shallow and not-too-deep cuts in a proportional puzzle proved extremely difficult to get right. I then decided to make it half-proportional instead, which makes it work out much better. (I still think it looks very nice despite this)

Even though it was possible to do it this way, there are still 18 pieces that end up meeting at EVERY vertex. Despite this the puzzle actually turns pretty good, with few lockups (although careful alignment is needed). The outer layers are phenomenal, although the inner layers are slightly stiffer. This is actually pretty unexpected, since I added the most tolerance to these layers.

In the middle of the turns you can see many of the hidden parts:
Attachment:
File comment: Master Rex Cube: Mid-Turn
DSC00330.JPG
DSC00330.JPG [ 1.45 MiB | Viewed 3538 times ]

Enjoy!

_________________
My Youtube channel
My Shapeways Shop


Last edited by benpuzzles on Thu Oct 24, 2013 12:05 am, edited 3 times in total.

Top
 Profile  
 
 Post subject: Re: Master Rex Cube
PostPosted: Wed Oct 23, 2013 4:25 pm 
Offline
User avatar

Joined: Mon Feb 27, 2012 10:57 am
Location: In my study drooling over my puzzle hoard - Precioussssss!
Unbelievable! :shock: :shock:

Having literally just now solved the Madter Curvy Copter and asked what Shapeways puzzle to get next, I immediately get shown this gorgeous thing!

I really hope it comes to fruition and available for me! :D :D

_________________
Kevin
Hopelessly addicted to puzzles!! :oops:
Visit my blog: Puzzlemad


Top
 Profile  
 
 Post subject: Re: Master Rex Cube
PostPosted: Wed Oct 23, 2013 4:36 pm 
Offline
User avatar

Joined: Thu Dec 02, 2004 12:09 pm
Location: Missouri
benpuzzles wrote:
Trying to fit not-too-shallow and not-too-deep cuts in a proportional puzzle proved extremely difficult to get right. I then decided to make it half-proportional instead, which makes it work out much better. (I still think it looks very nice despite this)
Agreed... it looks GREAT!!! However I'm not sure what proportional and half-proportional mean in this context. Typically I hear that used to describe LxMxN puzzles to tell you if all the cubies are the same size or not. Here we aren't talking about cubies so I'm not certain what you mean. Eager to see the video...

Carl

_________________
-
Image

Image


Top
 Profile  
 
 Post subject: Re: Master Rex Cube
PostPosted: Wed Oct 23, 2013 4:51 pm 
Offline
User avatar

Joined: Thu Dec 31, 2009 8:54 pm
Location: Bay Area, California
Beautiful! I thought your hint might be something like this. I thought you might be doing a variation on Eric's Rex Skewb.

Did you make this puzzle with Tetrahedral or Octahedral geometry internally? I've found octahedral puzzles with tetrahedral geometry to be very difficult to tension properly.

I really like "master" puzzles and "hybrid" puzzles because they offer lots of fun options for reduction solves.

_________________
Prior to using my real name I posted under the account named bmenrigh.


Top
 Profile  
 
 Post subject: Re: Master Rex Cube
PostPosted: Wed Oct 23, 2013 4:56 pm 
Offline
User avatar

Joined: Fri Dec 28, 2012 1:50 pm
Location: Near Las Vegas, NV
bmenrigh wrote:
Did you make this puzzle with Tetrahedral or Octahedral geometry internally? I've found octahedral puzzles with tetrahedral geometry to be very difficult to tension properly.

I made this puzzle with octahedral geometry, not only because of the tensions but also because it provides more gripping areas and stability for this particular case.
bmenrigh wrote:
I really like "master" puzzles and "hybrid" puzzles because they offer lots of fun options for reduction solves.

I can't even imagine how hard this will be... :shock:

_________________
My Youtube channel
My Shapeways Shop


Top
 Profile  
 
 Post subject: Re: Master Rex Cube
PostPosted: Wed Oct 23, 2013 5:01 pm 
Offline
User avatar

Joined: Wed Jun 19, 2013 2:50 pm
Location: Deep in the Heart of Texas
Every puzzle you've been presenting is great. I just want to own all of them, but I can't because I'm broke at the moment. I'm still waiting for the day when 3D printing is cheap. That will be the day I buy all the puzzles I want. And speaking of how hard this would be, we call on all of the major solvers *cough*Brandon*cough* to figure it out. I suggest a reduction method.

_________________
For all of you that bought a KO 8x8x8: You should have bought a V8!


Top
 Profile  
 
 Post subject: Re: Master Rex Cube
PostPosted: Wed Oct 23, 2013 5:06 pm 
Offline
User avatar

Joined: Sat Apr 21, 2007 11:21 pm
Location: Marin, CA
Wow, that looks great! Congrats! Sounds like it was fun to design, too.

_________________
Jason Smith posted here as 'io' through 2012.
Visit Jason Smith's PuzzleForge on Shapeways!
Jason Smith's Puzzles - YouTube Channel.


Top
 Profile  
 
 Post subject: Re: Master Rex Cube
PostPosted: Wed Oct 23, 2013 6:03 pm 
Offline
User avatar

Joined: Thu Dec 31, 2009 8:54 pm
Location: Bay Area, California
BelcherBoy2000 wrote:
speaking of how hard this would be, we call on all of the major solvers *cough*Brandon*cough* to figure it out. I suggest a reduction method.

I appreciate the sentiment but folks like Burgo and rline have put so much more effort into intuitive solving and tutorials I feel like I'm on the sidelines watching the pros.

Regarding solving this, how about some labels first:
Attachment:
master_rex_cube_labels.png
master_rex_cube_labels.png [ 827.41 KiB | Viewed 3671 times ]


A: Center
B: +Center*
C: X-Center*
D: Rex Tip*
E: Left-Wedge*
F: Right-Wedge*
G: Edge

* These parts all come in two orbits.

I see two ways to reduce. Shallow reduction groups:
B + D -> Shallow Rex Cube Tip Group
2xC + 2xE + 2xF + G -> Shallow Rex Cube Edge Group

Deep reduction groups:
A + 4xB + 4xC -> Deep Rex Cube Center Group
D + E + F -> Deep Rex Cube Tip Group

Personally, the "deep reduction" looks like it's easier. The Deep Rex Cube Center Groups look easy to form.

Step 1: Group up all +Centers to their corresponding Center with [1:1] conjugates.
Step 2: Group up all X-Centers to the corresponding partially formed groups with variations on [BRU&2, LUF, BRU'&2, RBD'&2, BRU&2, LUF', BRU'&2, RBD&2] (where the &2 means the slice)
Step 3: Group up all of the Left and Right Wedges with the Rex Tip pieces with variations (like the mirror) on [BRU&2, LUF, BRU'&2, RBD'&4, BRU&2, LUF', BRU'&2, RBD&4] (where the &4 means the middle slice layer)
Step 4: Solve the reduced "deep" Rex Cube.

Notice the commutator suggested has the same structure but variations on which slices are used is enough to cycle the various pieces and to form groups. If I had a copy of the puzzle to play with I'd work on ways to use conjugates rather than commutators for the bulk of the reduction.

_________________
Prior to using my real name I posted under the account named bmenrigh.


Top
 Profile  
 
 Post subject: Re: Master Rex Cube
PostPosted: Wed Oct 23, 2013 9:07 pm 
Offline
User avatar

Joined: Mon Feb 28, 2011 4:54 am
Wow! :shock:

I'll echo others and say how beautiful this is. I'm really in awe of your skills. This puzzle is a must-own. 8-)

_________________
Youtube Twisty Puzzling
Blogger Twisty Puzzling - Simple Solutions for Puzzling Twisties
Tutorials: Pitcher Octo-Star Cube | GERANIUM | Wheel of Wisdom


Top
 Profile  
 
 Post subject: Re: Master Rex Cube
PostPosted: Wed Oct 23, 2013 9:10 pm 
Offline
User avatar

Joined: Fri Nov 05, 2010 2:20 am
Location: Wherever
Are the deeper curves quarter circles?

Very nice!

_________________
A budding puzzle designer!

Check out my Shapeways shop!


Top
 Profile  
 
 Post subject: Re: Master Rex Cube
PostPosted: Wed Oct 23, 2013 9:54 pm 
Offline
User avatar

Joined: Sun Jul 14, 2013 11:10 pm
I'm just waiting for someone to take on the challenge of a rex cube that can make 60 degree turns :D

_________________
My budding baby blog, Twisted Interests!


Top
 Profile  
 
 Post subject: Re: Master Rex Cube
PostPosted: Wed Oct 23, 2013 10:20 pm 
Offline
User avatar

Joined: Wed Aug 17, 2005 8:26 pm
Location: Saratoga Springs, NY
Awesome!

I love the picture of all the points meeting at the corner. Makes me wonder what this would look like as a truncated cube with each point stickered...

_________________
I will not Reason and Compare: my business is to Create. -William Blake

Videos on Youtube!

New Designs on Shapeways!


Top
 Profile  
 
 Post subject: Re: Master Rex Cube
PostPosted: Wed Oct 23, 2013 11:14 pm 
Offline
User avatar

Joined: Fri Dec 28, 2012 1:50 pm
Location: Near Las Vegas, NV
Thanks everyone! I've updated the first post with better pictures and video.
wwwmwww wrote:
However I'm not sure what proportional and half-proportional mean in this context. Typically I hear that used to describe LxMxN puzzles to tell you if all the cubies are the same size or not. Here we aren't talking about cubies so I'm not certain what you mean.

Half-proportional in this context means the corner centers have half the width of the edge centers. If they were the same width, it would be fully "proportional."
rubikcollector123 wrote:
Are the deeper curves quarter circles?

They are very close, but not exact quarter circles. If they were, the edge pieces would become too sharp and the mechanism inside would become too thin.
Puzzlemaster42 wrote:
I love the picture of all the points meeting at the corner. Makes me wonder what this would look like as a truncated cube with each point stickered...

Here you go:
Attachment:
master cuboctahedron.jpg
master cuboctahedron.jpg [ 105.4 KiB | Viewed 3535 times ]

It's interesting to note that new pieces appear, due to the shapes of the cuts.

_________________
My Youtube channel
My Shapeways Shop


Top
 Profile  
 
 Post subject: Re: Master Rex Cube
PostPosted: Thu Oct 24, 2013 1:01 am 
Offline
User avatar

Joined: Thu Dec 31, 2009 8:54 pm
Location: Bay Area, California
benpuzzles wrote:
It's interesting to note that new pieces appear, due to the shapes of the cuts.
Those would be interesting pieces to solve. I'd reduce them to Skewb Corners and then treat the puzzle as a reduced Master Skewb. The three triangle pieces on each corner are the same as the Professor Skewb squares around each corner. The diamond pieces seem to be new.

_________________
Prior to using my real name I posted under the account named bmenrigh.


Top
 Profile  
 
 Post subject: Re: Master Rex Cube
PostPosted: Thu Oct 24, 2013 1:42 am 
Offline
User avatar

Joined: Thu Sep 17, 2009 6:07 am
Location: Germany, Bavaria
The understatement of the year:
benpuzzles wrote:
I still think it looks nice
It is sometimes amazing what can happen literally "over night" in a different part of the world!
I can echo only the superlatives of the replies before!!! :D
Awesome, unbelievable ...

_________________
My collection at: http://sites.google.com/site/twistykon/home


Top
 Profile  
 
 Post subject: Re: Master Rex Cube
PostPosted: Thu Oct 24, 2013 2:02 am 
Offline
User avatar

Joined: Tue Feb 08, 2011 3:17 am
Location: Australia
It looks so much like Eric Vergo's Rex Skewb (which I already own). I know it's different but my brain is finding it difficult to separate them visually! It's such a cool puzzle (both of them :lol: ).

_________________
1st 3x3 solve Oct 2010 (Even though I lived through the 80s).
PB 3x3 55sec Jan 2011 (When I was a kid 1:30 was speedcubing so I'm stoked).
1st 3x3 Earth (nemesis) solve Jan 2011 My You Tube (Now has ALLCrazy 3X3 Planets with Reduction)


Top
 Profile  
 
 Post subject: Re: Master Rex Cube
PostPosted: Thu Oct 24, 2013 2:36 am 
Offline
User avatar

Joined: Fri Jul 22, 2011 8:12 am
Location: Paris
You are too modest - this puzzle looks very nice; excellent job!!


Top
 Profile  
 
 Post subject: Re: Master Rex Cube
PostPosted: Thu Oct 24, 2013 2:19 pm 
Offline
User avatar

Joined: Fri Dec 28, 2012 1:50 pm
Location: Near Las Vegas, NV
I probably won't ever see it solved again...
Attachment:
DSC00331.JPG
DSC00331.JPG [ 1.46 MiB | Viewed 3323 times ]

Attachment:
DSC00332.JPG
DSC00332.JPG [ 1.45 MiB | Viewed 3323 times ]

_________________
My Youtube channel
My Shapeways Shop


Top
 Profile  
 
 Post subject: Re: Master Rex Cube
PostPosted: Thu Oct 24, 2013 5:30 pm 
Offline
User avatar

Joined: Sun Jul 14, 2013 11:10 pm
Have you contacted MF8 or WitEden on potential mass production? They seem to be most viable for the most complex puzzle designs to be produced, and I can definitely see this as having at least as much appeal as a Master Skewb.

_________________
My budding baby blog, Twisted Interests!


Top
 Profile  
 
 Post subject: Re: Master Rex Cube
PostPosted: Thu Oct 24, 2013 8:28 pm 
Offline
User avatar

Joined: Wed Jun 19, 2013 2:50 pm
Location: Deep in the Heart of Texas
I completely agree that it should be mass-produced, but keep in mind that the puzzle is designed for 3-D printing, not injection molding (that's how Americans spell it). If this design is tweaked enough to be suitable for injection molding, then it's got a shot. That's why so many puzzles are limited to Shapeways. I just hope that one day 3-D printing is relatively cheap so I can afford more great puzzles. But until that day comes, I will just have to stick with collecting mass-produced puzzles.

_________________
For all of you that bought a KO 8x8x8: You should have bought a V8!


Top
 Profile  
 
 Post subject: Re: Master Rex Cube
PostPosted: Thu Oct 24, 2013 10:33 pm 
Offline
User avatar

Joined: Sun Jul 14, 2013 11:10 pm
What are the differences between a 3d printing model and an injection mold?

_________________
My budding baby blog, Twisted Interests!


Top
 Profile  
 
 Post subject: Re: Master Rex Cube
PostPosted: Thu Oct 24, 2013 11:37 pm 
Offline
User avatar

Joined: Thu Dec 31, 2009 8:54 pm
Location: Bay Area, California
TheCubingKyle wrote:
What are the differences between a 3d printing model and an injection mold?

The differences are really significant. You can print pretty much any shape you want. Injection molding has a huge number of technical engineering design requirements that must be designed for. The list is very long and I'm not an expert in the area.

_________________
Prior to using my real name I posted under the account named bmenrigh.


Top
 Profile  
 
 Post subject: Re: Master Rex Cube
PostPosted: Fri Oct 25, 2013 2:42 am 
Offline
User avatar

Joined: Sun Mar 15, 2009 12:00 am
Location: Jarrow, England
bmenrigh wrote:
TheCubingKyle wrote:
What are the differences between a 3d printing model and an injection mold?
The differences are really significant. You can print pretty much any shape you want. Injection moulding has a huge number of technical engineering design requirements that must be designed for. The list is very long and I'm not an expert in the area.
3D printing, especially laser sintering, allows you to create just about any shape you want in a single piece. With injection moulding, you have to consider how the mould will split apart so you can remove the piece. Often, a thing which can be 3D printed as one piece has to be split into several parts when designed for injection moulding.

Injection moulded things tend to be much cheaper than 3D printed, although this depends greatly on how many you make as the mould itself is very expensive. Moulded parts also are generally more accurate and of a higher quality (especially surface finish) than the affordable 3D printed ones.

Here are some examples of moulds:
Attachment:
File comment: Injection Mould 1
mould 1.jpg
mould 1.jpg [ 129.32 KiB | Viewed 3113 times ]
Attachment:
File comment: Mobile Phone body mould
mould 2.jpg
mould 2.jpg [ 63.05 KiB | Viewed 3113 times ]
Attachment:
File comment: Click Pen Mould (8 cavity)
mould 3.jpg
mould 3.jpg [ 123.93 KiB | Viewed 3113 times ]
As you can see, mould design is neither easy or cheap.

_________________
My Shapeways Shop: http://www.shapeways.com/shops/gus_shop

Image


Top
 Profile  
 
 Post subject: Re: Master Rex Cube
PostPosted: Fri Oct 25, 2013 8:07 am 
Offline
User avatar

Joined: Sun Jul 14, 2013 9:43 am
That looks very difficult to solve; the "C," "B," "E," and"F" aren't on the normal rex cube. :scrambled: :scrambled: :scrambled: :scrambled: :scrambled: :scrambled:

_________________
ȨZRĄ is almost my name


Top
 Profile  
 
 Post subject: Re: Master Rex Cube
PostPosted: Fri Oct 25, 2013 9:58 am 
Offline

Joined: Sun Mar 27, 2005 7:37 pm
Great puzzle. I love the way it looks. Adding even more curves would look even better, anyone?

_________________
Image


Top
 Profile  
 
 Post subject: Re: Master Rex Cube
PostPosted: Sun Oct 27, 2013 5:43 pm 
Offline
User avatar

Joined: Mon Jul 30, 2001 2:50 am
Location: Nottingham, UK
What a fantastic puzzle!
I love it!!!


Top
 Profile  
 
 Post subject: Re: Master Rex Cube
PostPosted: Sun Oct 27, 2013 10:48 pm 
Offline

Joined: Mon Mar 07, 2011 11:08 pm
Now all we need is a Master Master Skewb.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 27 posts ] 

All times are UTC - 5 hours


Who is online

Users browsing this forum: Frank Tiex, rakaCN and 12 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

Forum powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group