Before saying anything else, I must tell that this design was created by MickeyB, and can be found on Thingiverse here : https://www.thingiverse.com/thing:53604
Sadly his .stl files contained some export errors, and I come here to directly provide you my .gcode for this wonderful chess set. As I had troubles to slice some parts with Simplify 3D (due to these errors), some were sliced with Slic3r PE, where I could correct the issues. Sadly those will take much longer to print.
Compared to the original design, this chess set was resized to 80%, and measures 34x34cm.
No support needed, no sanding, fits just perfect :-) You'll need some glue to assemble everything.
The author hasn't provided the model origin yet.