Amsterdam Cube
I saw this design in an amsterdam museum, and it's the first thing I designed myself on 123D. they were called "cu-briks" made by europlastic ages ago but im renaming them Amsterdam Cubes.
You can print a few and mix and match.
Made 2 in PLA with rep2 at 0.34mm & 0.15mm layers for the 3 & 1 cm cubes.
btw, the tolerance between the parts is 0.15mm.