CUBE.orig 3 Equal Part Puzzle

If you have not printed yet, use the -2 versions. Not a lot of difference and your slicer may make it a non-issue anyway.

You should print in the position the .stl files are already oriented.  I used .15mm layers, 2 side layers, 3 top and bottom layers, 15% infill.  No rafts, no support.  I used Prusament PLA.

Generally I always use the Prusa Slicr, but in this case I used S3D.   (I have not been using S3D for a long time, but found it occasionally works faster for some things; not necessarily better.)

You can triple up on your plate three times using three colors and you will end up with parts for three multi-color assemblies.   UPDATE: I have found that I get better results, less bridging--smoother inner surfaces, just printing one piece at a time.  Maybe it's just me.  Try both ways and see if you get better results with one or the other.