3x2x1 Rubik's Cube

I finally found the time to print a copy of my 3x2x1 Rubik’s Cube.  Having printed it, I’d make a number of improvements in the next design iteration.  I would:

• Make the circular slots in the center cubes smaller or the circular tabs in the four outside cubes larger.
• Enlargen the holes for the nut and bolt.
• Make these cubes solid so that they slide against each other easier.1
• Consider replacing the entire nut/bolt requirement with a connection similar to the becco block connectors.  This would make for a totally printable solution.
• Print the cubes two at a time to minimize warping without a heated build platform.

It slides reasonably well and is certainly functional.  However, after several center cube rotations I will tighten the center bolt.2

1. The four cube sections at the extremities are hollow. [↩]
2. The hole for the nut is tight enough that it doesn’t rotate as I turn the bolt. [↩]