how about 3d printing backup boat propellers? i dont own a boat. i imagine real propellers are somewhat expensive. and people often dont buy 2 to keep a spare

how about 3d printing backup boat propellers? i dont own a boat. i imagine real propellers are somewhat expensive. and people often dont buy 2 to keep a spare on board. and on occasion they do fail. why not a 3d printed backup propeller then? it only needs to last 1/2 a trip..only the way back...