Reprap Guru i3 v2
Created corners to glue on a cutting board (for a little traction) so the pieces wouldn't move as you (or your kid) builds the puzzle.
A great make!!
Thanks, I forgot to time the total print time but it was around 70 total hours with a primary speed of 60mm/s. I did split the last row (multiples of 9) into two prints just in case there was a hiccup.