Puzzle Lock // Sliding Puzzle

I made this Puzzle Lock as an entry in the MakeAnything Design Challenge over on MyMiniFactory. It can be used as a normal lock, that can be opened with the combination (Or by force. It's just plastic). You can make your own combination, or just stick with the one i came up with. The puzzle Lock is both useful and fun.
Hope you like it, and please share it if you make it.

How to assemble:
Print the following pieces:
- Lock
- Cover
- Base
- 4 * 1x1
- 2 * 2x1
- Key (Optional: a screwdriver works as well)

1) Place the 1x1's, 2x1's and Lock on the Base as shown on the picture.
2) Strew og glue down the cover.
3) Get solving! You can use the Key to easier move the pieces around.

Attention: Solving it you are free to rotate any part and note that the grid ontop is only there for holding the pieces in place.