Split 1x2x3 (Improved)

I printed [original NKCubed's design](https://www.thingiverse.com/thing:2356756) but could not assemble - it has too complex mechanism for a regular FDM printer. Fortunately I just finished designing my [Split 1x3x4](https://www.thingiverse.com/thing:2682910) and its mechanism is much easier to print. So I went that way.

All credits still go to NKCubed, consider this thing as just a polished version of his puzzle.

In this design I used 24mm blocks - I think the puzzle at this size looks and feels a little bit better. Though I am also uploading a 20mm version (at almost regular cube)

I added fillets to all edges, so all pieces do not catch each other on movements. 0.2mm tolerance works fine in my case.

One more note on the design. All pieces are bulging and can can't be printed as is without supports. First of all I do not like printing with supports, so I just split each piece into body and cap and then glued together. I printed my puzzle in ABS and used acethone as a glue.