You have to print every pixel in the "desired" color. They are named and counted for easier printing for you.
E.g.: Block_red_42 → Print this block 42 times in red color :)
Use the picture as a reference to find the right position of the blocks. It took me around 15 mins to assemble.
There are two connector types in the files. I experienced that sometimes the tight fit once work good and sometimes the looser one - try first which one suits you best!
Have fun! :D
Warning:
Use 0.2 mm height for the pixels and the grid. Other nozzle sizes than 0.4 mm also can affect fitting. So always test before printing everything!