3x2x1 Rubik’s Cube assembly pictures

The design should be pretty intuitive.  However, I went ahead and took some pictures of the assembly anyhow.

As I mentioned in an earlier post, I think this one came out really really well.  :)

3x2x1 Rubik’s Cube – done!

I’m so happy with the way this has turned out.

I’ve made a bunch of changes since the last revision of this printable 3x2x1 Rubik’s Cube puzzle:

  • I’ve totally redesigned the center barbell connector.  I simplified the design, removed the five support struts for each end and replaced it with a single support strut and a flat hexagon in the center of the piece.  The purpose of the hexagon is to give the barbell more contact area with the raft.  One of the earlier drafts didn’t have as many supports or this flat hexagon, and it tore off the build platform partway through the build.
  • I increased the diameter of the tube between the barbells.  This enabled it to print easier, made it a little more sturdy, and decreased the wobbliness of the barbell when everything is assembled.
  • I also shortened the entire barbell by 1mm, so that the entire puzzle is held together more closely.
  • I made the flat semi-circular tabs slightly thinner so they rotate a little more freely.
  • I significantly redesigned, thickened and simplified the two brackets that the barbell snaps into.  It’s been able to easily withstand numerous couplings/decouplings as well as numerous rotations.  With a few rotations, all parts now rotate easily.
  • All of the parts fit together SO much better than my first draft held together with a nut and bolt.
  • There is a slight bit of sideways flex that can occur with the use of the barbell.  It is really minor and it actually seems to help the puzzle be more forgiving as you manipulate it.  I see this more as a benefit than a design flaw.

The was one design choice on which I waffled.  I considered making the center cubes non-identical, with one having half a barbell stick out and with the other having the internal connector you see now.  This would have removed much of the sideways flex – since the barbell would be stationary.  I did not go with this design choice because whether the puzzle used one barbell and two connectors or male/female center cubes, there would always be some flex caused by the use of a connector rather than a static pin.  And, to be honest, I much preferred the symmetry of having everything assembled out of just three unique parts.

I know I’ve mentioned this before, but I really like the idea of a MakerBot printable toy that can be printed in one go and then assembled without tools or any additional hardware.  I also think this would make a great MakerBot print demonstration.

I’ll post some pictures of the parts a little bit later.

3x2x1 totally printable puzzle cube proof of concept success!

I’ve printed up pieces uploaded this morning to Thingiverse, tried them together, broke two pieces, modified them, printed, and fit some together.  I’ve just modified the STL for what I hope is the last time.  However, I have the barbell fit snugly into the center cube.  It rotates relatively freely and does not want to pop out.  (Of course, I’m sure it could/would if I applied enough force).  This leaves the outside cubes.  I modified the semicircular tabs a little and will reprint them later.

The only problem is that it takes about 40 minutes for my machine to print up two cube parts and a barbell, since they’re so solid.

The important thing is that I’ve just been able to print up and assemble the crucial mechanisms for this puzzle.  I think the next iteration may be what I needed.

New design: Rubik’s Cube (sorta)

Rubik's Cube for Dummies

Rubik's Cube for Dummies

I’ve already posted about how much I like TomZ’s simplified version of a Rubik’s cube.  Only problem is that I wasn’t able to encourage my MakerBot to print it.  Taking into account some of my ideas, I’ve designed a derivative.  It’s 4:45am at the moment – not a good time to have my MakerBot tooting and beeping.  ;)

Here’s what I’ve done with this version:

  1. Oriented the STL so it is immediately printable
  2. Run the STL through NetFabb to make sure it is manifold
  3. Reduced the number of unique printed parts from 5 to 2
  4. Put the STL together in such a way that you can print up two of the STL’s for a total of 6 parts, ready to be assembled
  5. Shrunk-ified the nubs for that fit into the center pieces
  6. Enlargened the grooves for the nubs
  7. Oriented the three parts so that they would use a minimal raft
  8. Changed the design so it will accommodate a nut/bolt attachment system rather than several additional plastic parts that must be glued together

In a future iteration, I hope to change the middle pieces so that all you need to do is snap the two middle pieces together.  Also, I’d like to incorporate any design suggestions from people who have tested this version.