Conventional Chess games are 2D in nature. Now with low gravity, we can maximise the space management and play chess in 3D! With these two platforms - Cube and Tube - the Chess matches will be even more challenging and even more brain stimulating: Perfect for our scientists up there in the vast relative nothingness. Now, i do not have any printer, but i never had issues with prints of 15% fill ABS. Since these parts are intricate and thin at times, i believe 15% fill is still good for any material. The set up can be like any conventional ones (Rook, knight, bishop, royalty, bishop, knight, rook) but this would have rooks next to each  other. I guess the arrangement can be chosen depending on the adopted strategy!