I doubled the thickness to 4mm. One side turned out perfect, the other side is also supposed to have the 42....but only the 2 printed. And, the backside doesn't look as nice. This is probably more a product of the printer, and not the design. Really like how it turned out. I think it took 30-40 minutes to print, but I did not note start/end times, so I didn't include them. I gave it a 4 star, even though the back doesn't look as nice, because I think it was due to the printer and not the design.