I liked the concept of Heikki_Hietala but I wanted to hide the plugs.
In the same idea as I needed to resize them, I made it customizable.

Provided STLs are 30mm sides.

Chess Set Credit : Alien Chess Set from ethanjurman

Instructions

Highly recommanded to print the test part first to check tolerances

For a complete chess board game you will need to print :

-2 times "Corner Color 01"
-2 times "Corner Color 02"
-12 times "Edge Color 01"
-12 times "Edge Color 02"
-18 times "Center Color 01"
-18 times "Center Color 02"

HOW TO USE OPENSCAD

• Download and install latest version of Openscad here. This is an opensource light software (21MB).

• Download the *.scad file and open it with Openscad

• Play with the values in the customizer panel (if it is hide go to view/hide customizer)

• Once you find the value you want/need, press F6 to render…and then F7 to export as STL.