Edit: Use the \"Rv4.STL\" version! Edit: For more print and assembly pictures http://makerblock.com/2010/08/3x2x1-rubiks-cube-assembly-pictures Want to read more about this design? Do you want me to make one for you? Check out my blog at http://www.MakerBlock.comNO TOOLS, NO HARDWARE, just print, clean, and assemble!!!This is similar to prior iterations of this 3x2x1 Rubik\'s-style puzzle cube - except it is intended to be a 100% printable, no hardware required design. It is inspired by:TomZ\'s 1x2x3 \"Friendlier\" Rubik\'s Cube, http://www.thingiverse.com/thing:2412 and R3becca\'s Beco Block connecting mechanism, http://www.thingiverse.com/thing:1983TomZ\'s original 1x2x3 puzzle was a totally printable design - but it required a peg that had to be glued in place. This means once assembled it couldn\'t easily be taken apart for cleaning, repair, etc.The X-ray screenshot should pretty well show the barbell connector as well as the connector mechanism. Both parts are similar to R3becca\'s own connector system - especially the barbell. However, the interior cube connector is a simplified version of her female connector - simply because it was too hard for me to replicate her designs. :)This version comes with a single STL for all parts: 2 identical center cubes, 4 identical edge cubes, and a single \"barbell\connector for the middle. I\'m leaving the initial version in case you want to play with it. I\'ve actually printed the last version, \"Rv4.STL\".I\'ve also done a better job of placing the parts and centering the entire set. Before you had to make sure your print head was exactly centered before you could try printing it. Now you should have far more wiggle room on any side.