This is nearly identical to my prior version http://www.thingiverse.com/thing:3485 . It's been slightly altered so that instead of totally hollow external cubes the interior sides come up to a point - so that there is a minimum 45 degree angle support for the top part. The next version I upload will have totally solid cubes with additional improvements discussed in this blog post http://makerblock.com/2010/08/revising-the-3x2x1-rubiks-cube/

All parts are contained within a single STL. Make sure your build platform is centered as closely as you can - the STL is nearly as wide as the full platform. Before converting to GCode, I used RepG to center the STL - you should too just in case.

For more reading about this puzzle cube and other nifty stuff, check out my blog at http://MakerBlock.com

1. Print the STL containing all parts.
2. Drill out the holes in the two center pieces so that an M3 nut and an M3x16 bolt will fit into either side.
3. Slot two end cubes into either center cube.
4. Bolt the two halves together.
5. Affix colored stickers or, as I did, glue colored pieces of paper.
6. Scramble.
7. Unscramble.
8. LRR. http://makerblock.com/2010/06/skeinforge-ui-suggestions/#identifier_0_1590