Remix johnboyjr model for multicolor.
All should print fine. I have yet to print it tho.
Scaling it down will cause some of the letters/numbers to n...ot print (they wil be to thin and get ignored).
I would not go lower then 82% scale if you want the numbers and letters to show up.
Support will be needed.
Slic3r with p2pp for the palette states it will be a 11h40m print at full scale.