Soulsword Free 3D print model

My attempt at (X-Men) Magik’s Soulsword. I’m new to 3D modeling and started by using Tinkercad, I am unsure of how printable the current measurements are. I intend to print the blade in two halves in order to have LEDs placed inside, hence the hollowed shape of the undersides. The build is meant to be around 40 inches long, 10 inches wide and 2 inches thick. Any advice is greatly appreciated!