Pieces fit together pretty seamlessly, since I assembled them in about 0.5mm of distance between them in the design.
I included the Sketchup file, the stl and, of the entire mystery
Stls of every piece. You could probably get away with nine or more at once, although I printed them one at a time.
Pieces are very straightforward but the details matter, so my printing speed slowed down about 50%. Don't need much infill either, 10-15% is
probably lots. Each piece took about 15 minutes.
For the color, I just finished it off with an ordinary blue sharpie! White PLA is easy to draw on.