A 1 by 1 by 2 (2 cubies) Rubik's cube that prints as one piece. No assembly required.
Modeled in Autodesk FormIt 360 on Chrome.
I've printed it on a Makerbot Replicator 2 with the following settings:
15% infill, rafts, NO support, 0.20mm layer height, 2 shells
Once it's done, remove the raft and give it a twist to pop out the tiny support piece in the hole. Add stickers and enjoy!
I didn't use anything to cover the hole, my stickers covered it so it is not visible.