Rubik's cube (classic style)

This is a famous Hungarian engineer Rubik puzzle cube. I'm designed this model myself in FreeCAD.

It has a next parts:
1 core (no support needed, 4 walls of 0.4 mm, 0% infill)
6 center "cubes" (no support needed, 3 walls of 0.4 mm, 20% infill)
8 corner "cubes" (support needed, 3 walls of 0.4 mm, 0% infill)
12 edge "cubes" (support needed, 3 walls of 0.4 mm, 0% infill)
6 pins for connect center parts to core (no support needed, 100% infill)
54 pads (in 6 different colors, no support needed, 100% infill).

Unlike my Dice Cube, this model has zero tolerance. Before assembling the cube, you need to remove the supports with a knife.

Instruction of assembly:

1. Connect each pin into center cube with a click sound. See that a hole in center cube has a groove and a pin has a skirt.
2. Insert a central cube into the core with a click sound.
3. Put this part on a table and assembly all of cubes (4 edges and 4 corners).
4. Insert another 4 central cubes into the core.
5. Put 4 edge cubes at a middle plane in according order.
6. Put 4 edge and 4 corner cubes at top plane.
7. Insert a central cube into the core with a click sound.
8. Put all of pads into cubes with glue (e.g. dichloromethane aka methylene chloride).

For the best result, it is necessary to lubricate the internal rubbing parts with Teflon grease.