This axe is 30 inches long and has been printed so for me it has worked. I found some pieces were a bit tricky and have done my best to modify them to give you the best chance to print out. File 1 has strong supports added to the tip. You will have to be extra careful taking it off. I broke it but to be honest it is such a small piece it didn't end my world.
I printed with 4 shells and 10% infill. I'm sure you could get away with 2 shells but I am now about printing things slow and strong.